Nick Offerman, the star of Parks and Recreation and Megan Mullally’s heart, has boarded Good Omens, the six-part television event based on the book Gaiman wrote with Terry Pratchett.

Offerman will play the U.S. Ambassador and father to Warlock, the child mistaken for the Antichrist. Like the book, the series follows the angel Aziraphale (Michael Sheen) and the demon Crowley (David Tennant), who aren’t exactly thrilled when the apocalypse and Final Judgement are on the horizon. Adding to their woes is the fact that the Antichrist child brought to Earth to kick it all off is M.I.A. That’s where Offerman’s character comes into play.

Gaiman had been teasing a special guest star for Good Omens on social media, and the acclaimed author and series showrunner finally revealed the casting on Tuesday. Gaiman shared an image of Offerman, who was “temporarily beardless” and “testing local drums for a 2 year old for volume+suitability (none of them were loud enough).”

I suppose you are still wondering who the Good Omens secret guest star I mentioned last week was...

— Neil Gaiman (@neilhimself) March 6, 2018

You are thinking, Neil, are you ever going to tell us who the mysterious Secret Guest was? Who could be so debonair and manly, so firmly fabulous that you would keep it a secret?

— Neil Gaiman (@neilhimself) March 6, 2018

Probably, you are thinking, you could post a photograph as a clue. And it's true, I could. #GoodOmens #SecretGuestStar

— Neil Gaiman (@neilhimself) March 6, 2018

And even if I posted a photograph of the mysterious Guest Star you might not recognise him. Not if he was the sort of person you were used to seeing with bountiful facial hair... #GoodOmens #SecretGuestStar

— Neil Gaiman (@neilhimself) March 6, 2018

Seen here testing local drums for a 2 year old for volume+suitability (none of them were loud enough): our Secret Guest Star. Ladies, Gentlemen & All Others, as the father (sort of) of Warlock Dowling, the (Not-) Antichrist,I present the temporarily beardless Mr @Nick_Offerman. pic.twitter.com/SLen4qKs7b

— Neil Gaiman (@neilhimself) March 6, 2018

The cast is filled with Jon Hamm as Archangel Gabriel, Derek Jacobi as Metatron (a.k.a. the Voice of God), Mireille Enos as War (of the Four Horsemen of the Apocalypse), Yusuf Gatewood as Horseman Famine, Lourdes Faberes as Horseman Pollution (she retired Pestilence after the invention of penicillin), and Anna Maxwell Martin as demon Beelzebub — among others.

Good Omens is expected to launch on Amazon Prime in the U.S. and BBC Two in the U.K. in 2019. Series director Douglas Mackinnon executive produces with Gaiman, Pratchett, Caroline Skinner, Chris Sussman, Rob Wilkins, and Rod Brown.