Episode: 4x17 (Season 4 Episode 17)
Name: It Gets The Worst at Night
Originally Aired: May. 09, 2007
Plot: The gang head to Texas on a rescue mission to save Mouth from his ill-conceived road trip with Rachel. In Texas, the teens get another shot at the Prom and Lucas and Peyton decide to take their relationship to the next level. Meanwhile, Brooke confesses to Haley that she lied about stealing the calculus exam and Nathan once again has to face his past mistakes surrounding his dealings with Daunte.