What makes great heroes? Great villains of course! And the TMNT have some of the greatest in pop culture! This fourth collection digs into the dark underbelly of the Turtles' world, focusing on Bebop, Rocksteady, Karai, and of course, the otherworldly Krang! In these stories from throughout TMNT history, see the characters develop from their early roots in the original comics to their monstrous present day incarnations. Delve into issues from the Mirage series that started it all, TMNT Adventures and Tales of the TMNT, to IDW's current ongoing universe. Uncover crucial tales of the powerhouse mutants Bebop and Rocksteady, the ninja antihero Karai, and the alien warlord Krang. Includes issues by TMNT co-creators Kevin Eastman and Peter Laird, plus contributions from Jim Lawson, Tom Waltz, Erik Burnham, Sophie Campbell, Cory Smith, Chris Allan, Michael Dooney, Joshua Williamson, Bobby Curnow, Jackson Lanzing, David Server, and others.