Back to the Future S02 E12 St. Louis Blues

"The time travelling adventures of Doc Brown, his family, and his friend, Marty McFly."

While at the Brown house, Doc's hair cutting invention wreaks havoc on Marty's hair. Marty and boys go to find Doc, who is with Clara at the 1904 World's Fair, to fix this mess. But Marty then gets put in a side show by P.T. Tannen.