Rachel Bilson and Clark Gregg join 'The To Do List'

The O.C.'s Rachel Bilson and Thor star Clark Gregg have signed up to the campus comedy The To Do List.

The actors join confirmed cast members Aubrey Plaza, Bill Hader, Connie Britton and Mae Whitman in Maggie Carey's directorial debut, which was previously titled The Hand Job.

The To Do List follows the adventures of a clever young student, played by Plaza, who arrives at college only to realise that she is not sexually experienced enough, Indiewire reports.

Plaza's character writes a "to-do" list to make up for it, surprising her friends in the process. Gregg and Bilson are most likely to play Plaza's conservative father and older sister in the comedy.

Gregg, best known for playing Agent Coulson in the Marvel movies, will next be seen in Mr Popper's Penguins and The Avengers.

Watch the Thor trailer below: