Episode Title:The Mutation Situation.Episode Description:The Turtles' mission to prevent the Kraang from delivering a shipment of mutagen to Shredder causes the mutagen canisters to scatter into the city, where one of them hits Kirby O'Neil, causing him to turn into a vampire bat mutant. Extremely upset and disappointed in the brothers for her father's mutation, an angry April O'Neil walks out on them.