1993 — 2001
The TV series ends with 2 episodes with the same title: "The Truth." Agent Mulder enters the secret base, where he kills the super-soldier who, in fact, cannot be killed. Despite the fact that he didn’t actually commit a murder, he’s accused and sentenced to death. Scully and Skinner set up his escape, and then both agents escape to Canada.
In 2016, the 10th season was released, which is also the continuation and restart of the series. It’s made in the format of a miniseries and consists of 6 episodes.