12. Between Order and Randomness

Lucas and Karen are at odds over his refusal to take the HCM test, with Karen trying to force him to take it by making his life uncomfortable. Brooke gets a job where her boss treats her and the other employees unfairly. She works to advocate for better working conditions for her and the employees and wins her argument. The experience makes her decide that she wants to run for student council president. Haley continues to email Chris, and when Taylor finds out she gets involved. When Taylor starts manipulating Nathan, he comes clean to Haley about sleeping with Taylor.

Haley confronts Taylor, who brings up her kissing Chris which leads to Haley quickly forgiving Nathan. Dan and Deb have dinner with Keith and Jules, where Dan tries to stir things up with Jules and blackmails her. Keith proposes to Jules and she accepts, but Lucas is weary of her intentions. Lucas decides to take the HCM test with Keith. He later accepts Keith's request to be his best man. Anna works to come to terms with her bisexuality. Taylor pretends to be Haley and ends things with Chris. Dan tells Lucas he’ll allow Keith and Jules to be happy if he moves in with him. This episode is named after a song by Shane Mills.