In the season 2 episode "Mirror, Mirror," Star Trek perfected the alternate universe trope long before Hollywood's multiverse obsession.

Add Yahoo as a preferred source to see more of our stories on Google. Rene Auberjonois speaking onstage at the 14th annual official Star Trek convention (2015) - Gabe Ginsberg/Getty Images By 1993, ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. "The Inner Light" is often cited as one of the best episodes of Star Trek: The Next Generation, ...

790 (Jeffrey Hirschfield), Kai (Michael McManus), Xev Bellringer (Xenia Seeberg) and Stanley H. Tweedle (Brian Downey) in promotional image for Lexx. Image via Sci Fi Channel In the classic Star Trek: ...