The Joker covers Gotham City in a cloud of laughing gas and begins plundering the crazed city. But after Alfred is infected with the toxin, Batman has added incentive to stop the Joker and acquire an antidote from him before all of Gotham dies with a smile.

Teaser: Hair... the complete story. Main Synopsis: Jesse and the Rippers have just finished another summer of touring. Stephanie and Michelle have had a crummy summer, and they are excited when a postcard from D.J. mentions that D.J. will be bringing home a big surprise when she arrives home from Barcelona. In an hour, the airplane with D.J. and Kimmy on it will be landing at San Francisco International Airport. At the airport, the surprise turns out to be D.J'.s new boyfriend Steve Hale, who was also in the summer study program. Stephanie and Michelle were hoping that the surprise would be better than this and that D.J. would at least act like she missed them, because D.J. was gone for 8 weeks. Still at the airport, Stephanie and Michelle meet members of the International Young People's Choir, and the choir is going to New Zealand. Stephanie falls for Terry, one of the members of the choir. Terry invites Michelle and Stephanie to come aboard the airplane and see the choir off, so the

October 5, 1957 - November 22, 1963: As a result of leaping again before he had a chance to complete his original mission, Sam finds himself leaping back and forth through the life of Lee Harvey Oswald. Following the sole assassin theory, Sam and Al attempt to prevent Oswald's attack on John F. Kennedy. But, with each leap giving Oswald more control over Sam's body, history seems doomed to repeat itself.

October 5, 1957 - November 22, 1963: As a result of leaping again before he had a chance to complete his original mission, Sam finds himself leaping back and forth through the life of Lee Harvey Oswald. Following the sole assassin theory, Sam and Al attempt to prevent Oswald's attack on John F. Kennedy. But, with each leap giving Oswald more control over Sam's body, history seems doomed to repeat itself.

Becky and Mark return to say goodbye before moving away.

Beavis and Butt-head use a frog as a baseball.

TEAMS: Ian Hislop & Charles Kennedy; Paul Merton & David Baddiel