Fox Mulder (David Duchovny) wasn't happy with his partner Dana Scully (Gillian Anderson) in episode 3 of "The X-Files" miniseries. She kept going into dangerous situations by herself without backup, but Scully joked with Mulder saying she did it because she's immortal. This was a nod to the popular fan theory that Scully can't die, and it turns out episode 3 might not be the only time this idea comes up on the six-part Fox show.

The idea that Scully is immortal started in the Season 3 episode, "Clyde Bruckman’s Final Repose," which was written by Darin Morgan. In "Clyde Bruckman’s Final Repose," the character Clyde Bruckman (Peter Boyle) can predict how people will die. However, when it comes to Scully he looks at her and tells her that she won't die. 

You can watch a clip of Scully and Bruckman below:

Morgan also wrote episode 3 of the miniseries, "Mulder and Scully Meet the Were-Monster." The writer told Entertainment Weekly that he "hopes" Scully isn't immortal and he put the line in the episode because he's aware of the theory.

"If people want to think that, good for you. It’s always struck me as being a silly notion, and that’s why I joke about it," Morgan said.

While it may not have been Morgan's intention to make it seem like Scully can't die, show creator Chris Carter may have taken the idea and ran with it. In an interview with the Huffington Post, Carter admitted that the show has pointed towards her being immortal.

"It's certainly been suggested, but I can tell you this: Stay tuned for Episode 6," Carter teased. 

Dana Scully Immortal "The X-Files" miniseries could finally answer the questions surrounding the mortality of Dana Scully (Gillian Anderson). Photo: Fox

Episode 6 is going to be the finale of the six-part miniseries. Carter previously revealed to E! Online that the miniseries will end of a cliffhanger. Does this mean that Scully's fate could be what's left in question?

"I don't think it's it for Mulder and Scully, but I have to say, there's no guarantee that we're coming back," Carter said. "So, while I see Mulder and Scully and stories down the way, we end up on a very big cliff."

"The X-Files" episode 4 airs Monday, Feb. 8 on Fox at 8 p.m. EST.