Back in 1990, everyone thought Mario was just a plumber with a hatred for turtles. But when Dr. Mario came out we realized there was more to him than we thought—he hated deadly viruses, too, and even though he chose to follow his destiny and become a plumber, he also had a PhD in puzzles. Dr. Mario rode the Tetris wave all the way to the bank, but unlike other passengers on Tetris's coattails, Dr. Mario was actually good. Plus Peach looked really cute as a nurse.