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Dr. Koopenstein starts the trouble by trying to steal the Marios' brains for his new invention, and then he really turns into a monster.
Episodes
1The Bird! The Bird! 2King Mario of Cramalot 3Butch Mario & the Luigi Kid 4Mario's Magic Carpet 5The Ringer 6Rolling Down the River 7The Great Gladiator Gig 8Mario and the Beanstalk 9Love 'Em and Leave 'Em 10Cold Spells 11The Great BMX Race 12Stars in Their Eyes 13Jungle Fever 14Brooklyn Bound 15The White Knight 16Toad Warriors 17The Fire of Hercufleas 18Count Koopula 19Pirates of Koopa 20Kiss 'N Tell 21Two Plumbers and a Baby 22The Adventures of Sherlock Mario 23Do You Princess Toadstool Take This Koopa...? 24The Pied Koopa 25Sing for the Unicorn 26Koopenstein 27On Her Majesty's Sewer Service 28Mario and Joliet 29Too Hot to Handle 30That Sinking Feeling 31Hooded Robin and His Mario Men 3220,000 Koopas Under the Sea 33Mighty McMario and the Pot of Gold 34Mario Meets Koop-zilla 35Doppelganger 36Koopa Klaus 37Mario and the Red Baron Koopa 38The Unzappables 39Bad Rap 40Underworld Connections 41The Mark of Zero 42The Ten Koopmandments 43The Koopas Are Coming! The Koopas Are Coming! 44The Trojan Koopa 45Stinging a Stinger 46Quest For Pizza 47The Great Gold Coin Rush 48Elvin Lives 49Plummers Academy 50Hitch in the Works 51Karate Koopa 52Mario of the Apes 53Princess, I Shrunk the Mario Brothers 54Little Red Riding Princess 55Fairies in the Spring 56The Provolone Ranger 57Escape From Koopatraz 58Mario of the Deep 59Flatbush Koopa 60The Missing Link 61Raiders of the Lost Mushroom 62Crocodile Mario 63Star Koopa 64Robo Koopa 65The Moblins Are Revolting