Time travel has been a staple of Star Trek for six decades. Here's how it works

The first chronological use of time travel comes at the end of Star Trek: The Original Series Season 1 , Episode 6, " The Naked Time " The real-life way Star Trek time travel works is, essentially, narrative convenience.

Time travel also shows up in the films, from Star Trek IV: The Voyage Home to the 2009 reboot Star Trek movie by J.J. Abrams .

Changes in the past affect the future of the Prime Timeline.

The Kelvin Timeline is the only alternate reality created by time-travel.

The Guardian of Forever implied to Philippa Georgiou that there was a period in the Mirror Universe's past where it was the same timeline as the one fans know.

Time travel can explain many things, including the rise of Khan Noonien Singh .

Join Captain Kirk and his crew on the Original Series' voyages of discovery, encounter the utopian vision of the Federation in The Next Generation , or delve into the darker corners of galactic politics in Deep Space Nine . No matter your preference, there's a Star Trek adventure waiting to ignite your imagination..