It's Luke and Manny's first school dance, and everyone gets in on the fun, Jay and Phil have to take the boys on a mall run, and Claire revels in the school-dance committee duties, but gets a little jealous when Gloria shows up to help.

While Phil spends some quality time with Haley, taking her on a college tour of his old alma mater, Gloria and Jay are forced to have 'the talk' with Manny.

Barney declares February 13th a holiday for desperate women; Marshall receives a Valentine's Day surprise from Lily; Zoey and Ted work on figuring out their relationship.

Lily and Marshall receive shocking news that has a profound impact on the gang; Ted begins his duties as best man for an old friend's wedding.

Marshall and Lily worry that Lily will never fall pregnant. To allay their fears, the couple visit a specialist who bears an uncanny resemblance to Barney.

Fawn takes Jess to a charity golf tournament; Winston lies about being a cop when he meets a beautiful woman.

Amy sees Mateo out on a secret date with Jeff, Glenn resents Jonah for outshining him at Cloud 9's Wellness Fair and Dina tries to prove Amy faked being sick.

Frank and Charlie discover that somebody has pooped in their bed; Dee leads the waitress and Artemis on a night out on the town.

After a rousing debate on people's rights and freedoms, Mac and Dennis run Paddy's without rules or restrictions.

The Philadelphia Eagles hold open tryouts, and Mac, Dennis and Dee use the event for their personal competition.

The gang decides to put on a wrestling show for returning troops; Dee is surprised when the soldier she's been chatting with online is not what she expected.

The waitress is getting married and Dee is jealous that she's beating her to the altar, so she tries to derail the wedding.

With the help and support of his friends, Charlie stages a rock opera based on his song "Nightman."

The gang learn that Charlie might have cancer and hatch a shallow-minded plan to alleviate his anguish.

Charlie and Mac set up a truly odd couple after Mac's mum burns the house down; Frank discovers the importance of paternal care after Dee falls ill.

After years of no recognition for the time spent in the bar industry, the gang tries to change its ways to please the patrons.

The gang gets a real scare after Dee reveals she's pregnant, forcing the guys to recall their last hazy Halloween party to determine who might be the father.

Frank accidentally gets into the child pageantry business; Dee tries to get revenge on stage mothers everywhere; Mac, Dennis and Charlie think they've found their dark horse.

The gang rallies around Charlie's mum as she battles cancer; Mac, Charlie and Dee struggle with their faith; Frank loses his memory and his mind in a quest for buried treasure.

Jeff makes a bad first impression with the head of the co-op board of their apartment building, after Jeff and Audrey offer to recommend them.