On the planet Vortis, the Doctor and his companions aid the butterfly-like Menoptra in their battle against the parasitic Animus and its mind-controlled minions, the ant-like Zarbi.
William Hartnell
Jacqueline Hill
William Russell
Maureen O'Brien
Catherine Fleming
Score: 5.6
Score: 6.7
Score: 7.4
Score: 4.3
Score: 0.0
Score: 7.2
Score: 6.0
Score: 5.8
