Robo Koopa (species)
From the Super Mario Wiki, the Mario encyclopedia
Robo Koopas are robots that are modeled after Koopa Troopas. Little is known about them, as they only made a few brief appearances in The Super Mario Bros. Super Show! episode "Robo Koopa". Their voices are identical to those of natural Koopa Troopas.
Two Robo Koopas are ordered by King Koopa to guard Dr. Nerdnick's workshop in Robo Land, where Dr. Nerdnick is captured. When Mario and his friends come to rescue Dr. Nerdnick, Luigi accidentally catches the Robo Koopas' attention by getting knocked over. Before the Robo Koopas can attack, they are quickly defeated by Mario and Toad.
Later on, a Robo Koopa makes another appearance, this time to alert King Koopa that Mario and Luigi have returned to fight him in their new Plumbinator suit. After King Koopa is exiled from Robo Land, the Robo Koopas are never seen again.
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