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.
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...
-Every song ends but is that any reason not to enjoy the music?
-Oh...that's skank! And, I think it's coming from you!
-Who knew my subconscious could be such a bitch?
-All the eyeliner in the world wont make you anything mais than a psycho stalker bitch.
-'Go Brooke yourself'
-At this moment there are 6,470,818,671 people in the world. Some are running scared. Some are coming home. Some tell lies to make it through the day. Others are just not facing the truth. Some are evil men, at war with good. And some are good, struggling with evil. Six billion people...
Rachel Gatina: Okay, let me get this straight. You don't have feelings for Lucas anymore, Peyton does, but she's willing to hide those feelings if you asked her to. Sounds like a pretty great friend to me.
Uncle Cooper: Is everything okay? Rachel Gatina: Yeah, I'm fine. I was just scared that you... Uncle Cooper: The baby Rachel, I meant is the baby okay. Rachel Gatina: Cooper, when we were arguing, I was so angry and I was hurt. So, when I said I was pregnant I was just... Uncle Cooper: Get out! I said get out!
Rachel Gatina: I know you saved my life. [Nathan looks uncomfortable] Rachel Gatina:...