Episode: 3x03 (Season 3 Episode 03)
Name: First Day on a Brand New Planet
Originally Aired: Oct. 19, 2005
Plot: On the first day of their senior year, Nathan and Haley have trouble adjusting as separated spouses. Nathan tries to avoid Haley at school and Haley is forced to deal with classmates teasing her about her tour. Meanwhile, Brooke continues to solely date Lucas non-exclusively, rules which Lucas has a hard time dealing with, and Lucas uncovers a shocking secret about Peyton's birth mother. Elsewhere, Dan confronts who he thinks set the dealership fire only to learn who saved his life.