Gilligan's Planet

After spending time as a castaway on an uncharted Pacific island, Professor Roy Hinkley managed to build an operational spaceship to flee the island with his fellow castaways, but bad luck rocketed them off into space and crash-landed them on an unknown planet. Now the castaways have more areas to explore and more dangers to face in their new environment, in which Gilligan adopts a new pet: reptilian alien Bumper.