The one and only, original Star Trek
• “The Alternative Factor” (Season 1, Episode 27)
Plot: The USS Enterprise investigates mysterious spatial disruptions that cause reality to “wink out” across the galaxy. The crew encounters Lazarus, a man who moves between our universe and a parallel universe composed of antimatter. If his matter self and antimatter self touch, it will trigger total matter-antimatter annihilation.
Only if he can kiss the green girl.
Apparently they didn’t think to arrange for a Jeffries Tube