Plot
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.
| Writer | Bill Strutton |
|---|---|
| Director | Richard Martin |
| Actor | William Hartnell, Jacqueline Hill, William Russell |
| Country | United Kingdom |
| Production | BBC |
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