Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave is going to propose to his new girlfriend in New York City - and dump them. They have three days to get to him and stop the proposal.

Danny Burton is a 30-ish carefree single guy who has watched most of his friends move on to serious relationships. When his last remaining friend Shannon moves out to get married, Danny searches for a new roommate. A promising candidate is Justin, the owner of Black Eyes Bar in Detroit (frequently mispronounced "Black Guys Bar"). Justin and his friends - the nerdy Burski, oddball Shelly, and recently out-of-the-closet gay guy Brett - all have certain qualities that make them appear "undateable".

A fresh and funny take on modern friendship and what one urban family will do to stay friends after the perfect couple who brought them all together break up on their wedding day. The failed wedding forces them all to question their life choices. Then there are Alex and Dave themselves, who strike a truce and must learn to live with the changes their breakup has brought.

Lonely guy Fred Stoller is thrilled when his good buddy, Vinnie D'Angelo, the world's happiest agoraphobic and fattest vegetarian, comes to live with him, until Vinnie also proves to be the world's most maddening roommate.

In the 1980s, a drummer is abandoned by his band just before they become rock superstars. Twenty years later, the drummer sees his second chance at stardom arise when he is asked to perform with his teenage nephew's high school rock band.

Tom and Hannah have been platonic friends for 10 years. He's a serial dater, while she wants marriage but hasn't found Mr. Right. Just as Tom is starting to think that he is relationship material after all, Hannah gets engaged. When she asks Tom to be her 'maid' of honor, he reluctantly agrees just so he can attempt to stop the wedding and woo her.