Doctor Doctor Guest cast, played by Vanessa Buckley Episode 1x01: Episode 1 (Sep 14, 2016) Episode 2x01: Episode 1 (Aug 16, 2017) Episode 2x03: Episode 3 (Aug 30, 2017) Episode 2x06: Episode 6 (Sep 20, 2017) Episode 3x03: Episode 3 (Aug 20, 2018) Episode 3x08: Episode 8 (Sep 17, 2018) Episode 4x01: Episode 1 (Feb 5, 2020)