The Powerpuff Girls
Strong-Armed / Power-Up Puff
S1 E1005:
Strong-Armed: When Bubbles breaks her arm and gets a powerful robotic cast, she must learn to stop being timid and embrace her smashy side to defeat the sleazy, sinister Pack Rat! / Power-Up Puff: During a fight, both Buttercup and Bubbles are surprised to discover they've leveled up, leaving Blossom to wonder when or if she'll get new powers too.