Following a successful junior career with the Peterborough Petes of the Ontario Hockey League, Landon was selected in the fourth round of the 1969 amateur draft by the Los Angeles Kings of the National Hockey League. He played three seasons for their minor-league affiliate Springfield Kings, backing up future Hockey Hall of Famer Billy Smith as the Kings won the AHL's Calder Cup championship in 1971. In 1973, Landon signed with the upstart World Hockey Association's New England Whalers and was the team's backup goaltender for five seasons. His best season was 1976, where despite a losing record provoked by the Whalers' anemic offense, he had a goals against average of 3.47, good for 9th place in the high scoring WHA.