The much-ballyhooed return of Marco finally occurs in this eponymously-titled episode, with Marco playing the titular Marco. Marco, Sharko. Sharko, Marco. We'll just leave you two to get acquainted. Also, don't drink that pee.

Deep within the Great Salted Lake of Many Fishes, Sealab has a slight problem: it's sinking into an ancient Native American burial ground. Can the never-before-mentioned crewmember known as John Bear summon the wisdom of the Great Spirit and save the doomed crew? And are those slots really the loosest in town?

Marco has a dark and terrible secret which threatens the very survival of the entire Sealab crew. "What could it be?" you ask. Well, that's a fair question.

How much would you pay for Sealab? Well, if you were the eccentric trillionaire Max Stone, it wouldn't matter: you could afford to pay full sticker price. And you could also afford a jetpack, a standing table at that posh little cafe on the moon that you like so much, and an army of troglodytes at the center of the Earth.

Doctor Quinn has invented a genetic-hybrid crustacean which wields, in its powerful claws, the power to eradicate world hunger. But only if he can keep those evil Grizzlebee's purchasing agents from getting their greasy manhooks on it. Although to be fair, they're really not all that evil. They're just kinda jerks.

Murphy and the Sealab crew are held captive... by the Bizarros!

Captain Murphy finds himself trapped under the monolithic "Bebop Cola" machine--for a year. During that time, he loses all of his teeth, battles an evil robot and has poignant flashbacks to his childhood as the son of a hard-drinking carny. He also becomes addicted to scorpion venom.