The X-Files: I Want To Believe (2008)
This was the 2nd X Files movie they made, between the original season ending (season 9) and before the relaunch of the franchise with seasons 10 and 11 recently. It’s a standalone story that doesnt have any elements of the alien mythology from the series.
As a thriller, it lacked something. There was no real tension and it fizzled out a bit. The story was fairly grisly - about a Frankenstein-type doctor. I’m not really sure what the clamour was to make this, it could have been a double episode to be honest.
Gillian Anderson is of course smoking hot in it. 5 Frankenstein heads out of 10.