Season 4, Episode 1: Fun RunOriginal Air Date—27 September 2007Michael accidentally runs over Meridith in the parking lot, and his guilt causes him to organize a 5-K run for her. Dwight and Angela have a falling-out after he kills her cat, and the Jim and Pam's relationship is discovered.Season 4, Episode 2: Dunder Mifflin InfinityOriginal Air Date—4 October 2007Michael feels threatened when Ryan returns to the Scranton office to share his ideas about the future of Dunder Mifflin. Jim and Pam's relationship…