They've been stranded on Earth for 20 years, so Zygon commander Kritakh, and his second, Torlakh, have had plenty of time to re-create their world. The trouble is that Kritakh, aka engineer Mike Kirkwood, has lost his sense of purpose. Can Torlakh, aka mass murderer Bob Calhoun, get him back on track. Enter sexy Psychiatrist Lauren Anderson, first, to be tempted by her innermost desires and then to face her greatest challenge. Can a violent heart really be tamed by love and what is the ultimate price to be paid?

When P.R.O.B.E. is summoned to investigate the savage murder of a retired headmaster, Liz Shaw is disturbed to find evidence of satanic rite near the scene of the crime. She soon discovers a web of deceit and corruption that extends back in time, threatening the current occupants of nearby Winterborne School. With P.R.O.B.E. under threat from within and the death toll mounting, Liz finds herself under increasing pressure from all sides to produce results... The Devil of Winterborne is at large and only Liz can stop it!

Behind the scenes on BBV's Zygon.