Crystal Jewels S01E49 - Run, Run (Part 4)

The brawlers need to get the balls back. When they are trapped by Hunter Grai, about to hurt them, Mouselette jumps up and puts him to sleep, and runs away with the Crystal Brawlers and Fiona. Fiona ends up looking for Mouselette and at the end of the episode, she thinks Mouselette is dead and is nowhere to be seen. However, Mouselette misses Shauna.