Teenage Mutant Ninja Turtles (1987)

S4E37 Big Bug Blunder

Title: Massive Insect Mishap Plot: A fly accidentally falls into a vat of mutagen, causing it to grow to an enormous size. Unable to manage the situation, Bebop and Rocksteady unleash the colossal creature onto Earth, creating chaos and mayhem as they try to contain the unintended monster.