Guest Stars Eugene Byrd as Dr. Clark Edison Sean Blakemore as Grayson Barasa Indira Varma as Inspector Cate Pritchard Michael Brandon as Roger Frampton Ed Coleman as Cyril Bibby Andrew Buchan as Dr. Ian Wexler Tuppence Middleton as Vera Waterhouse Ty Glaser as Heather Miller Ben Righton as Harry Bonham David Yelland as Gerard Bonham Jane How as Anne Bonham Sheila Reid as Paige Bonham Co Starring Simon Dutton as William Curry Nick Ellsworth as Jamison