- Eden Sher (Star Butterfly (voice))
- Adam McArthur (Marco Diaz (voice))
- Alan Tudyk (Ludo / King River Butterfly (voice))
Episode: Battle for Mewni: Moon the Undaunted
Air Date: 2017-07-15
Runtime: 11 min
Star must dig deep and challenge archnemesis Ludo in an effort to save her family and kingdom.