Teenage Mutant Ninja Turtles (1987)

S4E13 Back to the Egg

Title: Return to the Egg Plot: Krang enlists the help of a multi-dimensional ringmaster who has a plan to incorporate the Teenage Mutant Ninja Turtles into his circus act. To achieve this, he aims to use a powerful anti-aging serum to manipulate the Turtles, turning them into his star attractions. As the Turtles confront this bizarre scheme, they must find a way to thwart the ringmaster's ambitions and escape his clutches before they become permanent fixtures in his show.