Question: when does pam come back to the office season 5

title: The Office (U.S. season 9)
text: Stephen Colbert guest starred in the Halloween episode as Broccoli Rob , a former member of Here Comes Treble , Andy 's a cappella group . The episode `` Lice '' guest starred Julius Erving playing himself as an investor in Jim 's sports marketing business . Former NBC co-chairman and The Office executive producer Ben Silverman had a minor recurring role as one of Jim 's colleagues . He appeared in the episodes `` Here Comes Treble '' , `` Suit Warehouse '' , `` Customer Loyalty '' , and `` Moving On '' . The fourteenth episode , `` Junior Salesmen '' , featured several guest stars . These included Eric Wareheim as Gabor , Matt L. Jones as Zeke , and Will McCormack as Wolf . In the episode `` Promos '' , athlete Ryan Howard played a version of himself . Comedian Roseanne Barr had a two - episode arc as a talent agent named Carla Fern , and first appeared in the episode `` Stairmageddon '' . Michael Imperioli guest starred in the episode `` Livin ' the Dream '' as Sensei Billy , acting as a foil for Dwight . The episode `` A.A.R.M. '' guest starred Aaron Rodgers , Clay Aiken , Mark McGrath , Santigold , and Jessica St. Clair , all playing themselves . The series finale guest starred : Rachael Harris as Angela 's sister ; Joan Cusack and Ed Begley Jr. as Erin 's biological parents ; Malcolm Barrett as Stanley 's replacement ; and Bill Hader and Seth Meyers as themselves .