The X-Filesrevival comes to an end on Monday with the conclusion of the mini-series' mythology mystery.

In this exclusive sneak peek at the finale, Scully (Gillian Anderson) arrives at Mulder's (David Duchovny) house to find it ransacked and missing its paranoid resident. However, she does find Tad O'Malley (Joel McHale) standing amidst the chaos, claiming to have no idea what happened to Mulder.

But before the duo can figure out where Mulder is, Scully and O'Malley have a few issues to settle between themselves.

The X-Files finale airs Monday at 8/7c on Fox.