Air date: 10/27/90

Do the Koopa: Mario, Luigi, Toad, and Princess Toadstool seek the Doom Dancer Music Box in Koopa's Castle, but when the Koopas find out, they go after it themselves.
Kootie Pie Rocks: Koopa kidnaps Milli Vanilli and forces them to perform exclusively for Kootie Pie. This episode originally featured songs by Milli Vanilli, but later releases replace it with the show's stock music.

Crimes R Us/Life’s Ruff

Air date: 11/10/90

Crimes R Us: Koopa recruits a criminal from the Real World to teach the Koopalings how to commit crimes.
Life’s Ruff: Hip and Hop turn Luigi and the King of Ice Land into dogs and run off to cause mayhem in Florida. This is also the only episode of the three DiC Mario shows the doesn't feature Mario himself.

Up, Up and a Koopa/7 Continents for 7 Koopas

Air date: 11/17/90

Kooky uses his new "Raiser Upper" machine to levitate everything in the Mushroom Kingdom to the sky.

Mush-Rumors/The Ugly Mermaid

Air date: 11/3/90

Mush-Rumors: When a Real World family drives into the Mushroom Kingdom, the Mushroom People and the Koopas mistake them for aliens.
The Ugly Mermaid: While wearing a Frog Suit, Mario almost drowns, but he is saved by Holly Mackerel, a mermaid princess. Holly falls in love with Mario and tries to marry him.

True Colors/Recycled Koopa

Air date: 11/24/90

True Colors: Kooky and Cheatsy use a special paint to turn all the Mushroom People either red or blue and trick the two colors into hating each other.
Recycled Koopa: When the Koopalings can't get away with dumping their trash in the Mushroom Kingdom, they warp it all to Brooklyn. The Koopa garbage is turning the citizens into "Koopa Zombies", so Mario and Luigi must figure out a way to recycle it all and stop Koopa from turning Brooklyn into "Kooplyn”.

The Venice Menace/Super Koopa

Air date: 12/1/90

The Venice Menace: Koopa and Kootie Pie terrorize Venice with the Doomsub to warp the city to Koopa's castle and turn it into a water park for Kootie Pie.
Super Koopa: Kooky creates a pendant that grants Koopa the Mario Bros.' powers, but it only works in the Real World. Koopa kidnaps Luigi to lure the others to Paris to defeat them.