- Eden Sher (Star Butterfly (voice))
- Adam McArthur (Marco Diaz (voice))
- Alan Tudyk (Ludo / King River Butterfly (voice))
Episode: Monster Arm
Air Date: 2015-04-06
Runtime: 11 min
Marco breaks his arm before a Karate tournament. Star uses her wand to fix it, but accidentally gives him an evil sentient tentacle arm.