Chelsea encourages Charlie to help his ex-fiancée Mia launch her music career, but does he still have feelings for her? And what if she's a terrible singer? Meanwhile, Alan wants Charlie to let Melissa move in with him.
Alan is forced to take care of Judith's baby when Judith's mom falls off the wagon, and Jake tries to blackmail Charlie when he runs over Chelsea's cat.
Jake refuses to stay with Charlie and Alan after they embarrass him in public, so Alan tries to convince Charlie to work together to settle their differences and stop fighting with each other.
Charlie invites Chelsea's sexy friend to stay at his place while she gets over a breakup, secretly hoping that he will get a chance to have kinky three-way sex.
When Charlie's jealousy threatens his relationship with Chelsea, he turns to Alan for help in becoming a better person. But will he be able to pull it off?
Charlie hooks up with Chelsea's best friend, which could cause problems when Chelsea wants to get back together. Meanwhile, Alan is paid handsomely by a chiropractic patient who wants a different kind of adjustment.
Alan dates the mom of one of Jake's friends instead of telling her that her son and Jake went out drinking, but Charlie surprisingly does not approve of his actions.
While Alan and Jake go to Sacramento to pick up a grandfather clock, Charlie gets a prescription for medical marijuana to help him sleep and forget about Chelsea.
