Actor Martin Freeman is known for his memorable roles as Bilbo Baggins in the “The Hobbit” and Tim Canterbury in the BBC’s “The Office.” Those universes collided when Freeman hosted this weekend’s episode of “Saturday Night Live,” bringing viewers to “The Office: Middle Earth.” In a documentary style of the long-running comedy series, the Shire for Baggins explains that he’s been on a quest to save Middle Earth, and became a bit of a hero.