"Baby Mutant Turtles" is the 15th episode of Mario & Luigi's Stupid and Dumb Adventures.
Peach is screaming in pain when Shrek comes to examine the scene. He looks for her newborn baby but instead finds Bowser Junior, who frantically begins to attack him. Bowser Junior begins breathing fire and starts attacking Mario once he knocks Shrek down. Mario punches Bowser Junior and knocks him onto Peach. Bowser Junior stands up, grabs Peach, and runs out of the hospital room. Mario manages to put out the fire and finds that Shrek is unable to help him save Peach. Luigi instead has to join him.
In the kitchen, Black Yoshi is busy pouring some "real, black man" Grape Kool-Aid for Mario with Mr. Pig. Before Black Yoshi can take the glass of Kool-Aid to Mario, Bowser Junior runs in and Peach cries out for help. Mario arrives and orders Black Yoshi to kill the turtle. Black Yoshi is able to ward off Bowser Junior and receives a huge thank-you kiss from Peach. Black Yoshi claims he is stealing Mario's girlfriend, so Mario tries to win her back over. Unfortunately, she protests and Bowser tackles Mario.
- This episode marks the very first appearance of Bowser Junior.
- Bowser Junior does not make his next appearance until Bowser Juice Informercial, which is also his first speaking role.
- This is the shortest episode of the entire Mario & Luigi's Stupid and Dumb Adventures series.
- Luigi and Mr. Pig strangely disappeared in this episode after their short appearances.
- The episode's title appears to be a parody of the "Teenage Mutant Ninja Turtles".
- Luigi disappears after Bowser Junior was shot by Black Yoshi.