On their way to drive Karen home from the airport, Keith and Lucas collide with an oncoming vehicle, leaving Lucas unconscious and fighting for his life.
Taylor ruins Seth's night by keeping Summer away. Marissa's new friendships at public school worry Summer. Sandy forms a new partnership. Charlotte manipulates Julie and Kirsten.
During a show by rock band THE SUBWAYS, Taylor's behavior causes a major rift between Seth and Summer. Marissa is determined to end the conflict between Ryan and Volchok.
Marissa's sister, Kaitlin, returns home with attitude and a few secrets. Much more in the mold of Julie than Marissa, Kaitlin turns heads as she tries to get closer to her family.
The friends try to get Marissa back into their school. Sandy makes a decision that could change Marissa's fate. Summer's father and Julie have been lying to their daughters.
