E4 Thursday

The group reunite for the first time since the experiment ended, at a final dinner party, where they learn which marriages have flourished in the outside world

Beatlemaniac and games design student Zach takes to the stage with a music-inspired night, and conversation turns to a penguin that holds a military rank

Bart develops a crush on babysitter Laura Powers and plots to break up her relationship with bullying boyfriend Jimbo Jones. Featuring the voice of Sara Gilbert

The family heads to New York so Bart can go looking for ex-girlfriend Mary Spuckler (Zooey Deschanel) - and once there he revisits a few more of his old flames

Homer's new snowplough business proves an unexpected success, but drives a wedge between him and Barney. Featuring the voices of Linda Ronstadt and Adam West

Sheldon is delighted that Leonard finally has a girlfriend matching his high standards, but his over-exuberance looks set to cause problems

Leonard turns to Penny for advice on his relationship with Stephanie, who he feels is taking things too quickly and has already moved in with him

Everyone meets up at the Fourth of July parade, where Jay is acting as the grand marshal. The return of the comedy, starring Ed O'Neill

Haley needs help deciding whether to tell Arvin about her kiss with Dylan and goes to Mitch and Cam for their advice, while Gloria suspects Manny's Canadian girlfriend is made up