Star Wars: The Clone Wars
Water War
S4 E1:
The evil Separatists stir up trouble among the underwater natives of the planet Mon Cala, the Mon Calamari and the Quarren, after their king is assassinated. To stop a civil war, the Republic sends Padmé Amidala, Anakin Skywalker and a team of specially equipped clone troopers to aid young Prince Lee-Char, heir to the throne.