Tim has to cast an entire festival of short plays. Penny, who has just returned to New York from Los Angeles, worries that she has become irrelevant. Penny serves as a reader for Tim during his auditions, where she re-connects with her long-time crush, Eric.

Linda asks Tim to cast a prestigious new play, Iron Dog, which will be running in Boston. Eric tells Penny about a new acting class he's taking, and Raina convinces Penny to attend. Tim and Steven, who recently broke up, unknowingly flirt with each other on a dating site. The acting class turns out to be ridiculous, and Penny and fellow student Aaron bond while making fun of it.

Penny participates in a reading for the musical Intersections, whose cast is led by Eric. While Penny is away, Tim calls Aaron as a substitute reader for Iron Dog. During the Intersections rehearsals, Penny is annoyed by the flirting between Eric and the female lead. The Intersections reading is disappointing.

Penny and Aaron both serve as readers for Tim for the Iron Dog auditions. Steven meets Cameron, who comes in to potentially get signed but reveals that he doesn't want to be an actor any longer, and Steven is smitten. Penny has a traumatic experience auditioning for experimental dance troupe "DaBoSeRoy".

Tim keeps the news about Aaron a secret from Penny. At a party for potential investors for Iron Dog, Linda meets Steven and his new boyfriend Cameron, and Steven reveals to Linda that Tim is gay. Penny auditions for Iron Dog. Penny finds out that Aaron was asked to audition, and was cast, and the two have a fight. Penny gets cast in the Mean Girls musical.