The cast list for NBC's upcoming The Office spin-off keeps growing. Deadline is reporting that veteran actor Tom Bower will be joining the already confirmed Majandra Delfino and Thomas Middleditch on the series, which is tentatively titled The Farm. The series will exclusively star Rainn Wilson's Office character, Dwight Schrute, and focus on him and his family as they run a bed-and-breakfast that he inherited. 

Bower will portray Dwight's great uncle Heinrich Manheim, who is described as "charming, greedy, manipulative… and may have had to spend time in Argentina following World War II, thanks to his German National Socialist roots."

The series will be introduced as a backdoor pilot during an episode of The Office next season, with the possibility of being picked up later.

[via Deadline]