The fourth season consisted of 21 episodes and ran from September 27, 2006 to June 13, 2007.
As the end of High School approaches, everyone finds themselves at a crossroads in their lives. Nathan survives the accident and after some initial confusion, Haley is revealed to be pregnant while Rachel turns her attentions to Nathan after Cooper leaves town, using Nathan's theory that it was really Keith who saved him from the accident to get Nathan's attention. Rachel backs off when she learns that Haley is pregnant and Nathan later learns that he had a vision of Keith and it was this vision that...
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