Season 4, Episode 1: Fun Run 　　Original Air Date—27 September 2007 　　Michael 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 Infinity