David Tennant was a surprise guest on the Who's Calling Christian? competition on Christian O'Connell's Gold radio show in Australia. Long time fans will know that David was often a regular on Christian's radio show here in the UK and the pair have kept in touch since Christian emigrated to Australia.
David, who nominated himself, phoned in to promote the Australian airings of his new true crime drama Des, which starts streaming on Stan from 15th September and his lockdown comedy series Staged, which starts on ABC from 21st September.
Click here to listen to David's interview