Tygra, Panthro, and Cheetara are turned into ThunderCubs, when Mumm-Ra throws them into the Canyons of Youth. This had already happened to them before previously, yet Lion-O and Snarf act surprised when they find out. Also, they originally had to be restored back to their adult selves by going into the Cave of Time. But this time, they're restored to their adult selves when Lion-O uses the Sword of Omens.