Bach's Australian work includes science fiction series Farscape, playing Mike Power in based on a true story mini-series The Great Bookie Robbery (1986), and as Sir Ian Hamilton in the 2015 TV miniseries Gallipoli.
In 2010 Bach appeared in NZ science fiction series This Is Not My Life as the sinister Harry Sheridan, as magistrate Titus Calavius in Spartacus: Blood and Sand and in an episode of Legend of the Seeker.
He has also appeared in several New Zealand films, including Utu, Carry Me Back, Goodbye Pork Pie, The Last Tattoo, Pallet on the Floor, Old Scores (in which he had a central role), and Beyond Reasonable Doubt.
In 2014 he performed as body double for Saruman in place of Christopher Lee, who was unable to fly to New Zealand for principal photography on The Hobbit film series.
In 2021, he began a recurring role as Don on the comedy series Under the Vines, created by Erin White and starring Rebecca Gibney and fellow Lord of the Rings alum Charles Edwards.