The Beast Within is the 35th episode of the Teen Titans series and 9th episode of Season 3.
After a battle with Adonis, Beast Boy has a dramatic change where he is rude, eats meat and has a major temper that could burst at any moment. This causes the Titans to worry but soon things become worse when Raven and Beast Boy go missing and find Raven in the jaws of a werewolf-like beast. The creature is soon revealed to be Beast Boy and the Titans believe he is the one who attacked Raven. Will the team be forced to send Beast Boy to prison or is there something else lurking in the shadows?
Inside an animal testing laboratory, the Teen Titans fight Adonis. The battle-suited villain easily defeats four of the Titans, but enrages Beast Boy to the point where the latter literally cuts loose and attacks Adonis furiously. During their fight, they puncture a tank containing strange chemicals and get drenched by them. After Adonis is beaten, Beast Boy exits the lab in an extremely aggressive mood, leaving the other Titans bewildered.
The next morning, Beast Boy begins to display very untypical behavior, even for him: He suddenly develops an appetite for meat, becomes downright rude, meaner, and both more aggressive and hostile, and under stress even turns into his animal forms more frequently. When he finally feels unjustly provoked by Raven, he attempts to attack her, but is stopped and rebuked by the others, who are put off by his manners as of late. Beast Boy walks away to his quarters, breaking his furniture, and suddenly transforms into a huge hulking monster. Raven, passing by his room, hears a strange sound, but as she attempts to see what is going on, a monster comes out and attacks her.
Upon hearing Raven's cry, Robin, Starfire, and Cyborg rally, but they find Beast Boy and Raven missing and Beast Boy's quarters devastated by claw marks. Following Raven's tracer, they find her in the sewers hanging unconscious and injured from the fangs of a big green werewolf monster. The creature proves to be a very tough opponent to fight, and only with the greatest effort do the Titans manage to subdue it - to find out to their immense surprise that the creature was none other than Beast Boy; dazed, confused, and unaware of where he is.
In the Tower's sickbay, Cyborg notices upon analysis that a strange genetic compound has mingled with Beast Boy's DNA. Cyborg explains that because of Beast Boy morphing abilities, his genetic code has always been unstable. He assumes that Beast Boy may be finally falling apart. Robin starts to interrogate Beast Boy about what happened, but he firmly states that he cannot remember. When Robin starts to push Beast Boy too hard, the latter looses control and once again transforms into the werebeast, and immediately goes after Raven. The Titans drive him away and back into the city; Robin and Cyborg take up pursuit, while Starfire stays behind to take care of Raven. Robin ends up shooting an exploding Birdarang at the werebeast, which causes it to cry out loudly. Some time later, Raven wakes up, but she testifies that Beast Boy had not attacked, but saved her.Robin and Cyborg follow Beast Boy back into the sewers - to encounter actually two werebeasts brutally fighting each other. Initially, the other werebeast overwhelms Beast Boy, violently beating and throwing him about the sewers while taking no damage in return. After smashing him through the floor and into a lower level of the sewers, the other werebeast begins mercilessly beating the incapacitated Beast Boy until he seems to have been killed. As the foe turns away, Beast Boy manages to recover himself and later subdue his opponent, who turns back into his true self upon losing consciousness: Adonis, who had broken into the tower to attack Beast Boy. The werebeast turns into an unconscious Beast Boy the moment Robin and Cyborg found the two. It is at this moment that Robin and Cyborg realize just how powerful their supposed "weakest" member of the Teen Titans was.
After the strange compound is identified as the cause and an antidote administered, Beast Boy sits on the Tower island's shore, where he is joined by Raven. Raven explains to Beast Boy what happened the night of the attack: Adonis had broken in to the Tower, with intention to attack him and soon attacked her as well. Beast Boy is also disturbed and disappointed of his recent behavior and apologizes to Raven, but she assures him that it wasn't his fault as he was not himself. Beast Boy, however is also still shaken by the knowledge of what this new form is capable of, and is still fearful about this animalistic self lurking deep inside him. Raven gently reassures him that knowing when to let this bestial side out makes him all the more human. Feeling more mature now, Beast Boy considers a change of name. Raven tells him that they're having a moment, and to not ruin it.
- It's a likely possibility that in the sickbay/infirmary, Beast Boy (as the Beast) was in a rush to check up on Raven (which the others misinterpreted as intent to harm/attack). When he sniffed her and a look of anger crossed his face, there's a chance he looked angry because he knew she was hurt and he became angry at Adonis. That may be the reason he escaped the infirmary: to go after Adonis and get revenge on him.
- The animals that Beast Boy turned into in this episode is a wolf, a bull, a baboon, a tiger, a Bigfoot/Sasquatch, a rhinoceros, an Ankylosaurus, a lion, a bear, and the Werebeast.
- Beast Boy was mad at Raven because she makes fun of him, insults him, and tells him his sentence is grammatically incorrect (while he was facing Adonis).
- We've learned that Starfire's favorite show is "World of Fungus".
- This is the second time Beast Boy's toy cymbal monkey appeared in this episode from Fear Itself, but it was later seen when Beast Boy threw it against the wall thus breaking it.
- Beast Boy still used his Werebeast form in The End - Part 1.
- Beast Boy ate meat and eggs for the first and only time.
- If you listen to a certain part of the dialogue closely, it sounds like Beast Boy is saying "RAVEN!" in a muffled voice as the werebeast. This is the first time he is able to speak as an animal, yet the second time he spoke while not in human form.
- If you listen to Raven's scream closely, it sounds more like it came from Starfire rather than Raven. Some people believe that Raven and Starfire have the same voice actor, yet this is proven untrue.
- When Robin grabs a piece of Raven's cloak off the gate, it is torn. However afterwards, Raven's cloak is shown to be undamaged.
- Raven's position on the ground changes after Beast Boy (as the Werebeast) puts her on the floor. At first she was on her front side, but when Starfire flies over to her, she is on her back.
Beast Boy: I think my appendix and my spleen just switched places.
Adonis: You wimps think you can take down Adonis? Bring it on!
Beast Boy: Dude, it is totally brunged! Branged!
Raven: Ooh, bad grammar. That oughta scare him. (Beast Boy gets annoyed)
Robin: Titans, go!
Adonis: What's the matter, wimp? Don't you know how to fight like a man?
Beast Boy: I'm not a man, I'm an animal! (continues to fight Adonis)
Beast Boy: So, he was the one who hurt you, right? Not me?
Raven: He broke into the tower to attack you. And wound up attacking me too.
Beast Boy: Ugh!!! I can't believe I ate meat. I acted like a jerk. I'm sorry.
Raven: You weren't yourself.
Beast Boy: Cyborg says the chemicals at the lab messed with my DNA. Unleashed something primal.
Raven: And he gave you an antidote. You're better now.
Beast Boy: Yeah. But that thing, that beast, it came from inside me. And it's still there. I can feel it.
Raven: Good. If it wasn't for that beast, I might not be here right now. Having that thing inside doesn't make you an animal. Knowing when to let it out is what makes you a man.
Beast Boy: Hmm. Maybe you should call me...Beast Man from now on.
Raven: We're having a moment here. Don't ruin it.
Beast Boy: Beast Dude?
Cyborg: (the Titans are at the sickbay. Raven is seen floating above the bed in a healing trance) She's alive, but she's in some kind of trance.
Robin: She's healing herself.
Beast Boy: And you're telling me I did that to her? That's impossible!
Robin: We found you with her.
Beast Boy: NO! I wouldn't! I mean, we had a fight, but I would never!
Starfire: She was in your teeth.
Beast Boy: THAT'S A LIE!!
Robin: (walks up to Beast Boy) I'm going to ask you to keep your voice down!
Beast Boy: (staring angrily at Robin for a few seconds then softens up) What's happening to me?
Cyborg: (scanning Beast Boy's DNA on the computer) I'm picking up traces of recombinant DNA. It's not human.
Robin: The chemicals at the lab?
Cyborg: Because of the shape-shifting, his genetic code was always unstable. Maybe he's just finally falling apart.
Beast Boy: (worried about Raven) Raven. She's gonna be alright isn't she? I mean, she's not moving. What have I done?
Robin: You need to tell me what happened.
Beast Boy: I told you, I don't remember any of it. We had an argument, I went to my room, I was angry, and then nothing. Claws. A scream. Nothing.
Robin: Claws and a scream isn't nothing. What else?
Beast Boy: That's all!
Robin: No, it isn't! You have to focus!
Beast Boy: I am!
Robin: You have to remember!
Beast Boy: I'm trying!
Robin: Try harder! If you can't tell me what happened, I have to assume the worst! I have to put you in jail! You need to remember!
Beast Boy: I CAN'T!!!! (his heart monitor beeps like crazy)
Starfire: Beast Boy! (tries to go over to Beast Boy)
Robin: (hold his hand out) No!
Beast Boy: (changing) Get away from me!
Starfire: What is... (Beast Boy then turns into a werebeast, shocking the other Titans. Beast Boy in his werebeast form sees Raven floating above the bed and begins to run up to her)
Cyborg: (while punching Adonis) Come on, big man! Show me what you've got! Show me what you've got! (Adonis grabs him) Well, ok then. (he gets thrown to a wall)
Adonis: Nobody out muscles Adonis!
Beast Boy: Oh, yeah? Well, my muscles may be small and ropey, but they're not! I mean.... (Adonis attacks and fights Beast Boy)
Robin: Beast Boy, careful! The chemicals! (Beast Boy pushes Adonis against one of the tanks containing the chemicals and gets drenched by them in his grizzly bear form. He then repeatedly slashes Adonis until his suit falls apart and Adonis fall out of his suit unconcious. Beast Boy reverts back to his original form and starts to act and talk tough.)
Beast Boy: (angry) Who's the tough guy, now? (turns around and begins to leave)
Robin: Umm... Good job?
Cyborg: Nice intensity.
Raven: Yeah. Have any good freak-outs lately?
Beast Boy: (angrily turns to Raven) I just got sick of being pushed around. (Turns and leaves. As he walks out of the lab, the caged animals become scared of Beast Boy. The other Titans just stand and watch Beast Boy leave in confusion)
Raven: (Adonis pins her to the ground) Let me go!
Adonis: (Purrs) You're feisty.
Raven: (wakes up from her healing trance) Beast Boy...
Starfire: Rest. You are safe. He can no longer harm you.
Raven: He didn't hurt me, he saved me.
Starfire: From what?
Raven: (hearing the strange sound outside of her door) Who's there? (walks up to Beast Boy's room) Beast Boy? (before she can enter, four punches punched the door out of Beast Boy's room. Then a monster comes out of the room as Raven backs away a little. The monster then turns, sees Raven and attacks her.)
Raven: (Beast Boy bumps into Raven and drops her book. Raven picks up the book and turns to Beast Boy) Sorry.
Beast Boy: (angry) You'd better be. Why don't you look where you're going?
Raven: On second thought, I'm not sorry and you're a jerk.
Beast Boy: (stands angrily in front of Raven) You know Raven, I've been a really nice guy for a really long time. I've put up with your insults, your attitude, and I've had it! Consider this as a warning. As of last night, Mr. Nice Guy has left the building.
Raven: (angry) Is this the part where I'm supposed to be intimidated?
Beast Boy: (angry) No, THIS IS! (turns into a sasquatch and begins to battle with Raven)
Robin: (seeing Beast Boy and Raven fighting shows up with Cyborg and Starfire to stop the fight) BEAST BOY! Leave her alone!
Cyborg: What's gotten into you, man?
Starfire: You are behaving like a Royal Zargnarf!
Beast Boy: (turns back into his regular form and walks up to the other titans angrily) Look, this is who I am now! You guys don't like it? Tough!
Robin: Fine! If this is how you want to act, do it somewhere else! None of us are interested!
Beast Boy: (Beast Boy is unmoved. He angrily attempts to battle with Robin, but stops immediately) Hmph! That's what I thought. (then he leaves)
- Cyborg: (sees Raven unconsious and injured in the teeth of a werebeast monster) Raven!
Starfire: (gasps) (the werebeast puts Raven down safely on the floor)
Robin: Attack! (Cyborg and Robin fight off the werebeast while Starfire flies over to Raven to see if she's ok. The werebeast knocks out both Cyborg and Robin and sees Starfire kneeling next to Raven. It runs up to attack Starfire but was knocked away by Robin. Cyborg jumps onto it but it throws him off. It then charges to attack Starfire; however, she turns around and shoot starbolts at it. It then jumps onto her and attempts to devour her. But Starfire kicks it in the face and continues to shoot starbolts at it. The Titans combined their attacks on the werebeast and weakened it. When the smoke clears, the monster turns out to be none other than Beast Boy)
Beast Boy: (wakes up) Where am I? (he looks up and sees the Titans staring at him in disbelief) Why is everybody looking at me like that?
- Robin: (after Beast Boy defeats the other werebeast in his werebeast form, he reverts himself back to his original form while the unconcious werebeast reverts back too. Robin and Cyborg finds the exhausted Beast Boy and run up to him.) Beast Boy! (Robin then walks up to see the other werebeast which turns out to be Adonis.) Adonis. (It was then that Robin and Cyborg came to realize that Beast Boy wasn't intentionally hurting Raven, but he was actually saving her life the whole time. And they even came to realize that Adonis was the one who attacked her, not Beast Boy.)
- Raven: AAAAAHHHHH!!!!!!!
Robin: Raven! (runs up to Raven's room)
Cyborg: (walks out of Raven's room) She's not in her room.
Starfire: Beast Boy? (the Titans run up to Beast Boy's room only to find it destroyed and claw marks are everywhere)
Robin: What happened? (they walk up to Beast Boy's broken window and find claw marks on the side of the tower. They then go to Jump City to do a search and rescue for Raven and Beast Boy) Alright, team. We got two Titans missing and no explanation. We need answers, so split up!
- Starfire: (sees a shadowy figure with claws and speaks through Titans communicator) I have spotted something. Something with claws.
Cyborg: (through communicator) Staring into your coordinates.
Robin: Track it, Starfire. We'll be there as soon as we can. (finds part of Raven's cloak on a bar fence) Raven.
- Robin: (he and Cyborg finally manage to corner Beast Boy) Don't move! Cyborg: (Beast Boy growls and roars continuously) Just chill, man! It doesn't have to go down like this! (Beast Boy walks slowly to them as Cyborg and Robin pose to attack)
Robin: When I move, hit him with everything you've got. (Unknown to them, a brown werebeast creeps up behind them. Beast Boy notices him and jumps up to attack the brown werebeast) Now! (before they could attack, the werebeast pounces on Cyborg and Robin, knocking them down. They look up and see Beast Boy and the other werebeast fighting)
Cyborg: There's two of these things?! (the two werebeasts continue their fight)
- Cyborg: I've lost sight of whatever that was. (looks at the scanner and sees a red dot on it) But I just got a lock on Raven. She's moving fast! (stops at the sewer lid when Robin and Starfire shows up) She was here just a second ago!
Robin: No. She was down there. (opens the lid) The signal's coming from underground. Cyborg: (Cyborg checks his scanner and sees a red dot moving) Raven's stopped and she's close by. Come on!
- Starfire: Ohh, I wish to know that our friends are OK now, please.
Cyborg: Join the club. I can't even find BB's signal.
Robin: It's not Beast Boy I'm worried about. (they hear a loud roar from the distance)
Cyborg: I can't even locate the source!
Robin: Then split up!