Even though these characters only appeared in a single episode of a "Star Trek" series, they left an unforgettable mark on the franchise.

Many of the most memorable Star Trekaliens debuted on the TV shows, but a handful of classic alien races made their first appearance in the movies. Airing its first episode in 1966, Star Trek: The ...

From Kirk to Picard and beyond, from the dawn of the Federation to the age of Discovery, here's how to watch Star Trek in ...

A staple of the "Star Trek" franchise since its earliest days is its inclusion of imaginative extraterrestrial characters. Whether as members of Starfleet vessels or villains-of-the-week, the ...

Premiering in 1987, "Star Trek: The Next Generation" completely reinvigorated the "Star Trek" franchise on television. The series ran for seven seasons before ending in 1994 as the show's cast ...