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