David Tennant and Michael Sheen on what Crowley and Aziraphale want from each other (VIDEO)

(This interview was conducted prior to the SAG-AFTRA strike authorization.)

They have already thwarted the End Times. What else could the angel Aziraphale (Michael Sheen) and the demon Crowley (David Tennant) have in store for them, the two unlikely friends at the center Good omens? Apparently, quite a lot.

When the divine fantasy comedy returns for a surprise second season with six more episodes on Prime Video, the new mystery is what happened to the archangel Gabriel (Jon Hamm). After disappearing from Heaven—sending his strict officemates into a frenzy—Gabriel is found walking the streets of Soho toward Aziraphale’s rare book store…like Adam before the forbidden fruit.

Empty, with no memory of who he is or why he’s there, Gabriel pretends to know he’s in the right place. Somewhat. Aziraphale, who has a shocking history with his not-so-nice former boss, is less than thrilled, as is Crowley. The meeting “isn’t necessarily when Aziraphale was on his BINGO card that day,” Sheen notes with a laugh during an interview with co-star Tennant with StrippedPixel.

Despite their misgivings, the two team up, agreeing to hide the amnesiac angel from both Heaven and Hell until they figure out what’s going on. Remember nothing from the 1990 novel by Terry Pratchett and series co-creator Neil Gaiman, on which the series is based? Co-showrunner Gaiman said that the story for season 2 was inspired in part by discussions he had with the late Pratchett about what their second novel together would look like.

Although it looks like a battle of biblical proportions is looming again Omens, Aziraphale and Crowley are as united as ever. Translation: They’re still very much at odds on a large number of things, but they have each other’s backs, as usual. Tennant says, “Aziraphale and Crowley seem to be becoming more and more like an old married couple. They argue, crack and find each other absurd, but increasingly they are unable to exist without each other.”

Check out our video interview with Sheen and Tennant above for more on the central mystery of the upcoming season and what Aziraphale and Crowley want most from each other.