According to The Hollywood Reporter, which first broke the news Wednesday (Sept. 11), Oliver will reprise his role as Professor Ian Duncan for at least six of the upcoming fifth season's 13 episodes.
The actor-comedian was last seen in Season 2. He first guest starred in the show's pilot as the Greendale psychology professor who once employed the legal services of Jeff Winger (Joel McHale).
He joins previously announced Season 5 guest stars Jonathan Banks ("Breaking Bad"), Walton Goggins ("Justified") and Rob Corddry ("Childrens Hospital"), returning as Jeff's former law colleague.
Oliver received rave reviews from viewers and critics alike while subbing for "Daily Show" host Jon Stewart during the summer months.
While NBC has yet to confirm a premiere date for "Community's" fifth season, the cult comedy will begin airing in syndication beginning on Sept. 16, and will air Friday nights on Comedy Central starting on Sept. 20.