: Shredder, Krang, Bebop, and Rocksteady are introduced as the primary antagonists operating out of the Technodrome .
The first season of (TMNT) varies significantly depending on which era of the franchise you are interested in. Across its history, Season 1 serves as the foundational introduction to the four brothers—Leonardo, Raphael, Donatello, and Michelangelo—and their mentor, Splinter. 1987 Original Animated Series Teenage Mutant Ninja Turtles Season 1
: Reviewers from IGN praised the season for its "fluid, fast-paced" action and its "show within a show," Space Heroes . : Shredder, Krang, Bebop, and Rocksteady are introduced
This version was designed to be a more . 1987 Original Animated Series : Reviewers from IGN
: The Turtles celebrate their 15th "Mutation Day" and visit the surface for the first time, encountering pizza and the alien Kraang .
: The season concludes with the Turtles infiltrating the TCRI building , discovering their origin's link to the Utrom aliens, and Splinter mysteriously disappearing. 2012 Animated Series (Nickelodeon)
: It introduces the mutation of Hamato Yoshi into Splinter and the Turtles' first meeting with reporter April O'Neil .