He played for the London Broncos, Salford City Reds, Harlequins RL and the Castleford Tigers in two separate spells in the European Super League.

The following year, the Northern Eagles reverted to Manly and Dorn played in their first game back in the competition, a 20–30 loss against North Queensland at Dairy Farmers Stadium.

[8][7] In 2005 he moved to the Super League competition, joining the London Broncos, scoring 23 tries in 28 games in his first season and developing a reputation as a prolific try scorer.

[9][12] In total Dorn played for the London Broncos 160 times in two spells, becoming the club's all-time record try scorer with 104 tries.

[13] Castleford coach, Daryl Powell, said of him: "Luke is a player I have admired for a long time, his ability to play at half-back or full-back is massive and his leadership qualities and experience make him a key recruitment for us next season.