Harold, the rapidly aging teen.
Nikki Blonsky, Ally Sheedy and Colin Quinn have been added to the cast of the comedy Harold, all about a prematurely balding teenager (played by Spencer Breslin). Blonsky, in her first role after Hairspray, will play Harold's loyal, nerdy friend Rhonda. Sheedy, returning to her teenage movie roots (she played Allison in The Breakfast Club), will play Harold's mother tasked with the challenge of helping her son endure the teasing of his peers. Quinn, who I rarely enjoy watching at all, will play Reedy, "a drunken barfly who's a regular at a strip club Harold frequents."

Interestingly...
The movie will be shot at Blonsky's real-life former middle school, about which she says, "It's kinda creepy. I didn't have the best time there, so going back is definitely cooler."

Oh, and then there's this:
"Cuba Gooding Jr., one of the film's producers, plays a school janitor who befriends the troubled title character."

Source