Zig and Bernie try their umpteenth scheme to eat Marina, but when Sharko steps in at the last minute, Bernie gets flung out into the middle of the ocean. The harder he tries to get to the island, the further away he ends up...

Bernie searches the seabed for a weight to prime his catapult but a strange pumpkin follows him everywhere...Who's behind this prank squash that Bernie is scared of?

There's going to be an ocean floor marathon! First prize: a joyride in a submarine! Bernie already sees himself traveling back to the island... But the competition is tough!

Bernie builds a rocket to get back to the island. To speed things up, he agrees to take on a group of whelks who want to learn some hands-on skills. But he soon sees that the whelks have other ideas for his rocket...

Bernie sets out to find Zig using a jellyfish-drawn sleigh, but an accident scatters the jellyfish and changes Bernie's appearance. As he rounds up his team, Nora takes him for Santa Claus, setting back his plans...

Bernie sees Barbara gardening, and is inspired to grow a plant he can climb all the way up to the surface to be reunited with Zig! But the plant takes forever to grow. Our hermit crab hero decides to give it a helping hand...