Episode Title:The Gauntlet.Episode Description:After April receives a warning from her imprisoned father which arrived on a pigeon mutant named Pete, she and the Turtles embark on a mission to save him and stop the Kraang from detonating a mutagen bomb in the city. But the Turtles aren't prepared for anything when the Shredder makes his move on them and an accident that involved the mutagen inside the bomb turning Bradford and Xever into the akita and snakehead mutants "Dogpound and Fishface".