Eve (The X-Files) - Production

Production

Freelance writers Kenneth Biller and Chris Brancato pitched the idea for this episode to series creator Chris Carter under the title of "The Girls from Greenwich", with the focus being on genetic experiments conducted on sets of twins. The characters of Teena and Cindy were named after the wives of Glen Morgan and James Wong, who rewrote the original script prior to filming. "Eve" was the only episode of The X-Files to be directed by Fred Gerber, who Carter felt "brought some interesting stuff to it".

The producers initially looked for twins to play the roles of Teena and Cindy in Los Angeles, but child labor laws made using children from there so difficult that they instead searched locally in Vancouver, finding Erika and Sabrina Krievins. The difficulty in finding suitable actors for the roles had led producer R. W. Goodwin to consider casting one actor in both roles and using special effects and body doubles to create the impression of twins; however, this idea was rejected as it would have proved too impractical and expensive. The scenes in the episode set in the roadside diner were filmed in a café in White Rock, British Columbia, whose large gravel car park helped it appear "very rural in its setting". A large awning was used to complement the exterior shots of the building.