Peacocks forthcoming Office-world comedy series is continuing to build out its cast.

Seven actors Duane Shepard Sr. (The People vs. O.J. Simpson),Allan Havey(Billions, Mad Men), Nate Jackson(Young Rock),comedian Mo Welch,Nancy Lenehan(The Boys, Veep),Molly Ephraim(A League of Their Own, Last Man Standing) andTracy Letts (Saturday Night, Divorce) will have guest roles on the series from creators Greg Daniels and Michael Koman. Welch is also a writer on the series.

Details on their parts are being kept under wraps for now. They join a cast led by Domhnall Gleeson and Sabrina Impacciatore and which also includes Melvin Gregg, Chelsea Frei, Ramona Young, Gbemisola Ikumelo, Alex Edelman, Tim Key and Eric Rahill.

The untitled series is set in the same world as The Office but will follow a new set of characters. The shows logline reads, The documentary crew that immortalized Dunder Mifflins Scranton branch is in search of a new subject when they discover a historic Midwestern newspaper and the publisher trying to revive it.

Daniels, who developed the American version of The Office, and Nathan for You co-creator Koman are the creators of the new series, which comes from Universal Television. They executive produce with Ricky Gervais and Stephen Merchant creators of the original Office series for the BBC as well as Howard Klein, Ben Silverman and Banijay Americas.