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