The Clinic Guest cast, played by Keith Duffy Episode 2x03: Episode 3 (Oct 31, 2004) Episode 2x04: Episode 4 (Nov 7, 2004) Episode 3x05: Episode 5 (Oct 23, 2005) Episode 5x04: Episode 4 (Oct 21, 2007) Episode 5x05: Episode 5 (Oct 28, 2007) Episode 5x06: Episode 6 (Nov 4, 2007)