Two dogs escape from a laboratory and are hunted as possible carriers of the bubonic plague. John Hurt,Christopher Benjamin,James Bolam,Nigel Hawthorne,Warren Mitchell,Bernard Hepton,Brian Stirner,Penelope Lee,Geoffrey Matthews,Barbara Leigh-Hunt,John Bennett,John Franklyn-Robbins,Bill Maynard,Malcolm Terris,Judy Geeson,Philip Locke,Brian Spink,Tony Church,Anthony Valentine,William Lucas,Dandy Nichols,Rosemary Leach,Patrick Stewart,Percy Edwards
