The Green Planet Ratoniik!
S4:E32
2013
IMDb
Potomuri finally believed Tenma's story that Katra still lived, but still couldn't understand why Katra didn't appear before him. The two members of Shitennou, Ryugel Baran and Gandales Baran, thought that they arrived to a planet called Ratoniik but ended up getting lost on an unknown planet.