S04E01: 'The Avengers'

As The O.C. returns for its fourth season, the gang is adjusting to life without Marissa Cooper.

Summer is attending Brown University in Rhode Island, where she has reinvented herself as a left-leaning, tree-hugging activist under the sway of Che (guest-star Chris Pratt).

Ryan has moved out of the Cohen house and is dealing with Marissas death in the only way he knows how, and when he misses a special dinner at the Cohens, Seth finds him on the wrong side of the tracks and calls Summer for help.

Meanwhile, Julie Cooper will do anything even yard work to avoid dealing with Marissa's death.

Kaitlin earns a new pair of boots from Dr. Roberts in true Cooper fashion.

And Taylor hides out in the diner so no one will know she is not in Paris.