Attack of the Mousers

The episode begins in the turtle lair. The turtles brought April home with them because they didn't know what else to do. When she sees them, she's sure she's dreaming and, upon seeing Splinter, faints.

Meanwhile, Baxter Stockman is using his Mousers to tunnel into bank vaults and rob them. By the time the police arrive, the Mouser's were already gone.

When April woke up, she was ready to talk the turtles and agreed not to tell anyone about them. April asked about what the turtles were and Splinter told her a story.

A while ago, four baby turtles fell into a sewer along with a metal canister from a truck. The canister's ooze got on the turtles and Splinter rescued them. Both the turtles and Splinter became larger and more intelligent. When they were ready, Shredder taught them ninjutsu and named each of them after Renaissance artists.

After the story was finished, they saw a new report about Stockman's bank robbery and were able to recognize it as his work. They decided that they would defeat Stockman.

Meanwhile, the Mouser's returned with the money. Stockman's mysterious benefactor called to check that the plan was working.

In the sewers, the turtles were starting off to defeat Stockman. While still in the sewers, they came across the first alarm, which April and Donatello disabled. From there, they managed to enter the ventilation system and reach a computer terminal. April was able to create blank spots in the security system so the turtles can travel undetected.

Stockman spotted the turtles when they entered the factory floor. He started attack them with some lasers, but they were able to avoid them and confront Stockman. Stockman recalled the entire Mouser horde to help him. Using the Mousers, Stockman was able to escape. April was able to stop the attack, but only by setting them all to self-destruct. The turtles escaped and Stockman's laboratory was heavily damaged.

While escaping, Stockman was stopped by Hun. Hun took Stockman to their master to account for his mistakes.

At the turtle lair, the turtles, April, and Splinter watched a news report about the mysterious destruction of Stocktronics and disappearance of Dr. Stockman. Together, they celebrated their victory.

Meanwhile, Stockman was speaking with his benefactor, trying to smooth things over. However, he was told that he had to pay the price for failure. Hun dragged Stockman out to deal out the punishment. Once Stockman was gone, he looked at an infrared image of the turtles.