In the 6th season opener, Charlie runs into an ex-girlfriend and a child who bears a striking resemblance to Charlie.

Chelsea's illness gives Charlie a chance to prove he can take care of her, but also yearning to run away from the situation.

Charlie is visited by the ghosts of his ex-girlfriends while Alan and Jake are on a road trip.

Charlie and Alan try to set up Evelyn with Russell the pharmacist.

Alan and Jake meet Walden Schmidt, a broken-hearted billionaire.

Alan invests Walden's money in Kate's fashion line; leading a double life takes its toll on Walden.