Guest Stars Caroline O'Neill as Win Thursday Abigail Thaw as Dorothea Frazil Sara Vickers as Joan Thursday Adam James as Kent Finn Gillian Saker as Dr. Pat Amory Geff Francis as Grantly Smalls Natalie Grady as Ruth Hargreaves Katherine Kingsley as Mona Davies Abram Rooney as Dr. Clifford Gibbs Chris Fulton as Dr. Broderick Castle Tristan Sturrock as Dr. Bernard Gould James Laurenson as Professor George Amory Daniel Attwell as Mick Mitcham Robert Luckay as Professor Yuri Gradenko Dawn Hope as Adelaide Smalls Ruby Thomas as Tessa Knight
