Joe enlists King Arthur's help with a Camelot. Meanwhile, Emily worries that Jennifer is pregnant.

Felicity disowns her family after Roger argues with Jane over a drill. Meanwhile, Joe believes his parents have been taken over by aliens.

Jane and Emily try to become fit together, while David becomes a fanatical vegetarian to impress Lisa.

Joe is offered a place at Swindon School of Science, but receives conflicting advice on whether he should go.