As stoic in his way as Spock, Mr. Sulu has had his share of crazy moments in Star Trek history.
For as long as the character has existed (and he dates back to the second Star Trek pilot, "Where No Man Has Gone Before," where he started as the ship's astrophysicist), Lieutenant Hikaru Sulu has always been the cool-as-ice, largely unflappable human member of the Star Trek bridge crew, second only to Mr. Emotionless himself, Spock. As played by George Takei, the helmsman delivered either the most dire sensor readings or the most prosaic orbit status in a calm and composed manner, even if the Enterprise (or the planet it was circling, or the universe, or ... etc.) was on the verge of conquest, war or destruction.
But Sulu was indeed only human, and he was prone to his moments of breaking down, getting angry or going off the path just like anyone else -- usually under the influence of alien mind control, an inhibition-breaking virus or something equally unsettling. And when that happened, watch out, because Sulu was capable of anything.
In honor of George Takei's 80th birthday, here are nine moments when Sulu's chill veneer shattered or very nearly did -- moments that often displayed a whole different layer or other side to this beloved and often underused character.