He was selected in the 1957 World Cup squad despite not being contracted to a club, having left Blackall in dispute over a release.2005 Annual Report – Australian Rugby League (p. 51) This return to representative rugby league at age 24 saw him rise to new heights. He played in three matches of the tournament, was top scorer with 28 points and named "Player of the 1957 World Cup". During the World Cup, Carlson also became the first Australian fullback to score a try in an international match when he scored in Australia's 26–9 win over France at the Sydney Cricket Ground (he also kicked 7 goals during the game).1957 RLWC – Australia vs France at Rugby League Project. Rugbyleagueproject.org (22 June 1957). Retrieved on 2018-07-15. He also played in all three Tests in 1957 against the visiting Great Britain side.
