Ep 5. Enter Mutagen Man

In Teenage Mutant Ninja Turtles (1987) season 5 episode 5, titled "Enter Mutagen Man," viewers are introduced to the character of Seymour Gutz, a janitor working in the same lab where Professor Perry used to work. After accidentally ingesting some mutagen, Seymour mutates into a blob-like creature with the ability to absorb and mimic other materials.

Meanwhile, the Turtles are dealing with their own transformation, as Donatello creates a new machine that can switch their minds with each other's bodies. They decide to use this device to better understand each other and learn how to fight as a more cohesive unit. However, they soon discover that the machine has an unexpected side effect, causing them to switch bodies with other beings they encounter.

As the Turtles try to figure out how to reverse the effects of the mind-switching machine, Seymour (now known as Mutagen Man) begins wreaking havoc around the city, absorbing an ever-increasing amount of materials and growing in size and strength. The Turtles must use all their ninja skills to try to stop Mutagen Man before he becomes too powerful to defeat.

Throughout the episode, viewers are treated to the signature humor, action, and adventure that have made the Teenage Mutant Ninja Turtles franchise a beloved classic. The Turtles' personalities shine through as they navigate their strange predicament, and Mutagen Man serves as a formidable (and gross) antagonist for them to face off against.

Overall, "Enter Mutagen Man" is a fun and exciting episode that showcases the unique blend of comedy and action that has made the Teenage Mutant Ninja Turtles franchise so enduring. Fans of the series will enjoy seeing their favorite heroes in a new and challenging situation, while newcomers will be drawn in by the compelling characters and thrilling storyline.