Deep Space Vacation - S3.E9

Noticing that K.O. and Enid are sad that Rad is still on Planet X, Mr. Gar gives them his old space bike and tells them to take a vacation. The two arrive only to learn that the shape shifting Cosma has devoured the planet whole. As K.O. and Enid desperately attempt to rescue the planet from being digested, Rad and his family do not seem to care.