He played in all of the Brisbane Broncos" first four grand final wins from the interchange bench and retired as the most-capped Bronco not to have played representative football. Plath was a Queensland Schoolboy rugby union representative in 1986/87. He played rugby league for Wynnum-Manly Seagulls before he was graded by the Brisbane Broncos from their Colts team in 1990.
Plath also had a season with the London Crusaders in 1991-1992.
The following year he again played in the Broncos" grand final, helping them to a second consecutive premiership. He was a replacement player in Brisbane"s 20-14 loss to Wigan in the 1994 World Club Challenge at Language Park.
After retiring from playing, Plath spent two years at Wynnum-Manly as a development officer and Chief Executive Officer.