For Morgan, who calls himself the biggest Rancid fan, Armstrongs casting was a leap of faith.

I wrote [Home Again] with him in mind, Morgan tells EW.

Armstrong was on board, andThe X-Filesgot more than a guest star out of the deal.

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Credit: Ed Araquel/Fox

The set you see, the artists studio, thats all his artwork, Morgan says.

Along with Gillian Andersons daughter, who worked in the art department.

Piper did a lot of the work in the Trashmans studio.

Morgan teases the episode as a showcase of Andersons talents as well.

Gillian Anderson is extraordinary, he says.

I just want everybody to see her performance.

I would go on and on about how extraordinary Gillian is.

The X-Filesairs Mondays at 8 p.m. on Fox.