Mutagen Man Unleashed

Mutagen Man Unleashed is the fourth episode of the second season of the 2012 TV series - and the the 30th episode in the entire series. It aired on November 9, 2013.

Plot
The episode starts off with Mikey watching a new show (which is similar to Voltron), called SAMFF. The others initially complain about how bad it is, but then get into it. Donnie leaves after watching a scene where a male character is rudely turned down by a girl he likes and heads off to his lab. He talks about April in front of the mutated Timothy while trying to create an antidote for the mutagen. However, he fails and instead, freezes the solution. He vows to create a cure in order to win April back, but as soon as he leaves, Timothy sucks up the little bit of Kraang mutagen.

Meanwhile, at Roosevelt High School, April vows to start over and forget everything that happened. However, she gets knocked down by a hockey puck and meets Casey Jones. Right away, April doesn't like him, despite being assigned to him as his tutor. She agrees to help him in trigonometry and they set up their first session in the park.

On a roof top that night, Mikey comes across a lone pizza box with one slice inside. At first, he's suspicous of it, but then decides to eat it. However, he suspects three figures snooping about and is tackled by his brothers who were practicing stealth. While the others are busy, Donnie goes to the park, knowing April studies there a lot and spots April and Casey swinging and talking. He suddenly becomes jealous when Casey reaches out to wipe a smudge off her face. Donatello tries to get closer, but lands in a dumpster, startling the two.

Back at the lair, he vents his jealousy of April "seeing" Casey while also installing a voice box for Timothy. Timothy tells him that he likes April, but he's too upset about what he saw to pay any attention to him. At that moment, Splinter calls Donatello into the dojo, which allows Timothy to drink the whole canister of mutagen without being noticed. Splinter decides to teach Donnie to "like" falling down, which confuses him. After a few times, Splinter tells him that the point of the exercise is that no one can be forced to like something. Of course, Donnie realizes that he means that Donnie can't force April to like him. Unbeknownst to either of them, Timothy breaks out in search of April on the surface. He tries to get someone to help him find her, but everyone is terrified of him.

The Turtles head for Timothy as Donnie tells his brothers everything that happened, including that he knew about April and Casey are "dating". They stop and split up into two teams, one going to the park and the other going to April's apartment. However, they miss her as she walks home with Casey. At that moment, Timothy finds April, but Casey tries to fight him off with a lead pipe. Unfortunately, he gets knocked out and April takes over the fight. Timothy tries to talk to her, but she continues to attack him as Casey jumps back in, only to be kicked out again. Timothy tries to grab April as she cowers in fear. Just then, Casey rides up on his bike and speeds out of the alley with Timothy close behind. Casey manages to send him into a truck as they escape. Timothy tries to pursue them, but the turtles find and fight him. Before he can kill Raph, Leo steps in and frees him. Donnie stops Leo before he can do any more damage and explains that Timothy wants to help them. However, he tells them that he wants April to be his friend and he doesn't want to help the turtles. Just then, he powers down and the turtles succeed in getting him in the Shellraiser.

On the way back to the lair, Raph asks why they're bringing Timothy back. In addition to saying Timothy wanted a friend because of how he spoke about April, Donnie says that maybe his DNA can help him create an antidote. During the conversation, though, he drinks another canister of mutagen and busts out of the Shellraiser. The turtles prepare to split up again, but Donnie tells them that he knows where Timothy is going: April's apartment.

At the apartment, Casey is carefully scanning the area for any more mutants. Before she goes inside, Casey talks about when their next "date" should be. At that moment, Timothy prepares to go after April, but the turtles show up and Leo tells them to keep him in the alley to prevent Casey from seeing him. April notices the fight and tries to keep him from walking towards the turtles. She looks in the alley and thinks that they were responsible for the attack. The turtles barely fend him off, but Donnie comes up with a plan to use stealth to distract him. Donnie comes back with a canister filled the freezing solution. The others root for the success, but Donnie sadly looks over the frozen mutant.

Back at the lair, the turtles are watching SAMFF while Donnie sits away on the couch, mourning the loss of Timothy and April. Splinter shows up and tells him that while April chooses to stay away from the turtles, there is hope that they will reconcile eventually. Donnie watches as the female character from before kisses the nerdy kid, restoring his optimism.

Trivia

 * Like Space Heroes, SAMFF is used to foreshadow events for season 2.
 * When Casey is walking April to her apartment, you can see "Second Time Around," her shop in the comics
 * This is the first appearance of Casey Jones.

Gallery
See Mutagen Man Unleashed/Gallery