Never Koop a Koopa The Adventures of Super Mario Bros. 3 : Season 1 Episode 6
TV-Y7 NBC 4h 46m int(0)
Aired: September 22nd, 1990 @ 11:30 AM EST on NBC
In a surprising move, King Koopa and his kids leave the Mushroom Kingdom. When Mario and the Princess check out the supposedly empty Castle Koopa, they discover it's still just as dangerous and that Koopa lied so he could attempt a take over.