10 Star Trek: Voyager Episodes That Were Almost Completely Different

10. Tuvix

Tuvix, endlessly doing the rounds in debating circles, originally came to life in a plot that would ensure no one, least of all Neelix or Tuvok fans, would ever really remember the episode. In truth, it was originally going to be a slapstick comedy, one that even the writers weren't proud of.

Kenneth Biller, Brannon Braga, and Michael Piller, all worked on the script after the pitch came in. Biller recalled joking with Braga over how to name the character - Nulok? Tuvix? (surely not!) The jokes got so bad at one point that the pair even came up with a little theme song for the show.

Then there was the ending. In the beginning, Tuvix was going to sacrifice himself upon realising that the ship needed Tuvok and Neelix to survive, and would go about separating himself to ensure that happened.

No one was happy with this idea of a comedic character effectively killing themselves to return to the status quo, never to be mentioned again. Biller set about adding darker plot points, ditching the theme tune, and adding that ending with Janeway. The resulting episode remains a fan favourite for debate and discussion to this day.