Teenage Mutant Ninja Turtles (1987)

S5E17 Zach and the Alien Invaders

Title: Zach and the Galactic Intruders Plot: Zach, the Turtles' youthful companion and unofficial fifth Turtle, has a deep passion for comic books, particularly 'The Galactic Intruders.' However, when his parents sign him up for the Ten-Hut Military Academy, they intend for him to gain some structure and experience life outside his fantasy world, prompting him to hang up his Turtle outfit for good.