Johnson won the silver medal at the novice level of the 1974 U.S. Figure Skating Championships. She gave up competitive skating in 1977 to turn professional and join the Ice Capades, and subsequently began an acting career, making her film debut in Ice Castles, in which she portrayed Alexis "Lexie" Winston, a figure skater who is blinded by a blood clot in her brain. The film, a romantic drama co-starring Robby Benson, was a minor success in December 1978, grossing $18 million in the US. Johnson, who was described as "an appealing young woman who actually happens to be a good skater who can act" by film critic Roger Ebert, was nominated for a Golden Globe as "New Star of the Year in a Motion Picture – Female" for her performance in the film.