The Mega Bloks Teenage Mutant Ninja Turtles Rocksteady Villain Pack Collector Series is a building toy set featuring the character Rocksteady from the Teenage Mutant Ninja Turtles franchise. Made by Mega Bloks, this set allows fans to construct and play with a detailed representation of the iconic character. With a theme of ninjas and turtles, this collector series is perfect for fans of the TMNT characters and offers a fun and creative building experience.