Who should come aboard SeaLab but the Bizarro versions of the crew, such as Bizarro Debbie, Bizarro Marco, Bizarro Murphy, Bizarro Sparks, Bizarro Stormy, and a sort-of Bizarro Dr. Quinn. The Bizarros hold the real crew captive, before beginning to torture the real crew. With Bizarro Torture.

Sparks starts pushing a new, "mostly kelp" energy pill that proves to be highly addictive.

Due to a faulty door, the Sealab crew gets locked in a tool closet. A few black eyes result as they try to get out, but then they discover that a pack of unfed killer dogs are running around Sealab.

Capt. Murphy can't seem to find his ""Happy Cake"" cupcake oven anywhere. He sends the Sealab crew out to find it, only to find it's in the (many) hands of a giant octopus.

Murphy is stuck under a soda machine. To make matters worse, everyone else is out at a concert and can't help him! To make matters worse still, who should happen upon poor, defenseless Murphy but an angry scorpion and a tooth-collecting maintenance robot?

After running up thousands of dollars in credit card debt, Murphy can't come up with a way to pay for it all...until Sparks intervenes. He takes out life insurance policies on the crew before sending them on a fatal fool's errand, and proceeds to kill Captain Murphy with a homemade tesla coil in the hot tub. However, Captain Murphy grabs Sparks as he is being electrocuted, killing Sparks as well.

Under orders from Capt. Murphy, Stormy & Quinn attempt to hook up pirated cable-TV. After getting a picture, something goes haywire and sends Stormy & Quinn repeatedly back in time about 15 minutes. Then, after getting a picture, something goes haywire and sends Stormy & Quinn repeatedly back in time about 15 minutes. Then...

Murph blows the whole Sealab budget on making the place "Feng Shui" paying a scam artist to redecorate the whole place.

A mysterious Asian visitor brings an irresistibly cute Gloop (reminiscent of shmoos) onto the station, which Murphy names Squishface. There are two problems, though: Gloops stink, and they multiply so fast that eventually Sealab is overrun with them. This episode parodies "The Trouble With Tribbles", Gremlins, and Aliens. There is also a reference to the popular fps shooter Return to Castle Wolfenstien when Debbie calls out "I need ammo!" and a bullet icon appears over her head.

Sealab is in danger, but nobody cares. The crew wonders what it would be like to be robots, while Quinn tries to deal with the impending disaster.

Debbie wants to have a baby so she starts to interview the crew to see who will be the father. Marco makes time with the other Debbie (aka "Black" Debbie).

A series of unexplained thefts leads Murphy to declare "Martian law". In the ensuing madness, everyone ends up blaming Quinn for all the thefts.

Capt. Murphy's attempts at a happy Alvistide go awry thanks to non-Alvian crew members, an uncooperative electrician, and Alvis himself "crapping the buffet".

The electricity is out in Sealab, and the crew tries to turn the power back on. This episode shows the outside of the Sealab for 8 minutes, during which time nothing happens besides Stormy destroying a section of the Sealab, and occasional appearances by fish, sharks, and bubbles.

The Sealab crew attempts a daring rescue mission to Ice Station Zebra, one of whose inhabitants has turned to cannibalism. They are accompanied by a German who "came with the sub," bears more than a passing resemblance to Jürgen Prochnow and is given to firing his pistol inside the sub and shouting "Sieg Heil, Cornelius Drebbel!" Unfortunately, the two inhabitants of Ice Station Zebra cannot be rescued due to a lack of wetsuits, thanks to Debbie packing an attractive dress for herself instead.

Murphy, bored to tears, starts his own pirate radio show called "Howlin' Mad Murphy" until the FCC Search & Destroy team shuts his @*! down!

Behind the scenes at the chaotic "set" of Sealab 2021. In this episode, the voice actors use their own names rather than the characters'. The episode is a parody of Living in Oblivion by Tom DiCillo.

The crew of Sealab (along with a vapid gossip-show host, a bear in lederhosen and guest stars Kid 'n Play) star in a sneak preview special for the movie Tinfins, complete with plenty of ads for the restaurant Grizzlebee's: "You'll wish you had less fun".

Kommissar Murphy brings Marxist-Leninist ideals to Sealab.

A flesh-eating invisible monster has invaded the Sealab and is killing everyone. The crew tries to lure it into a trap by having Dolphin Boy wear a life-jacket made of meat.

A loophole in the Sealab charter turns everyone into captains, except Stormy (too stupid), Quinn (too proud to exploit the loophole), and the Chinese crew members (because of previous Asian accomplishments, including anime, among other things). How will Sealab survive? And where did Capt. Murphy go?

An orphan says he is terminally ill so he can go to Sealab.

While lounging in the pool, Dr. Quinn is repeatedly electrocuted by Stormy throwing various devices into the water. Quinn's resulting hallucinations are strangely hysterical.

An accident leaves Quinn comatose and Stormy allegedly smarter. Have they really switched brains?

A network executive audits the set of the hard-hitting action drama Sealab 2021, with hopes of somehow salvaging the dwindling series.