McCallum is a British television series that was produced by STV Productions. Dr Iain McCallum was the original lead character, played by John Hannah. McCallum was a forensic pathologist who traveled by Triumph Motorcycle, and solved murders. The character had … Richard Moore, John Hannah, Zara Turner, James Saxon, Gerard Murphy, Richard O'Callaghan, Alex Walkinshaw Added on Amazon Prime 2022-05-21.