The third season consisted of 22 episodes and aired between October 5, 2005 and May 3, 2006.
Three months later, things pick up where they left off at the beginning of the summer. Lucas and Peyton spent their summer together and are hiding a secret from Brooke when she returns from California and proposes a non-exclusive relationship with Lucas. Brooke takes pity on a homeless Haley and takes her on as her roommate. Haley tries to win back Nathan, who has spent the summer at "High Flyers", a basquetebol, basquete camp, however Nathan isn't ready to trust Haley again. He pays Chris to come back to Tree...
The segundo season consisted of 23 episodes and ran from September 21, 2004 to May 24, 2005.
After Lucas and Keith learn of Dan's coração attack, they return to árvore colina and Dan decides he wants to get to know Lucas. Lucas cautiously enters into a relationship with his father. After Dan learns that Lucas has inherited his hypertrophic cardiomyopathy (HCM), the genetic defect which caused Dan's own coração attack, he convinces Lucas to mover in with him and pays for his medication, keeping his condition a secret. Dan also agrees to stay away from Keith and his girlfriend Jules (guest star, Maria Menounos)...
Haley: You can work your whole "I'm Nathan Scott, Mr. Big Shot, scoring my touchdowns" on somebody else because- Nathan: I don't even play football. Haley: Whatever. The point is at the end of the dia all your bluster and BS don't mean anything to Math. 'Cause Math don't care and neither do I. Nathan: Well does English care? 'Cause I really suck at that too.
Nathan: Don't say I never gave you anything.
Haley: I'm really fine. Nathan: Little high on yourself aren't you? Going around saying you're all fine?
Nathan: What are you, my tutor or my shrink? Haley: Whatever you need.