S4, E5: When Lucas discovers that newcomer Derek's (recurring guest star MATT BARR) interest in Peyton is more than brotherly, Derek becomes menacing. Haley feels Nathan slipping away after he receives a scholarship offer to attend Duke University. Meanwhile, as rumors of Brooke's pregnancy spread, Rachel (recurring guest star DANNEEL HARRIS) uses the Internet to set Brooke up on a blind date with an o...