(IAN is forced to his knees. (The run from the cage and PRAPILLUS joins HROSTAR in attacking the ZARBI whilst BARBARA and HLYNIA see to the larvae gun. DOCTOR: The Menoptra are massing on the planet Pictos. He picks it up and crushes it against the wall of the Crater. They are spreading the poisonous web of the Animus to every corner of Vortis. They were taken by the Zarbi who were everywhere. VICKI: What?
Plan: A: the planet; Q: What is Vortis? A: Ian; Q: Who is the Doctor's companion? A: Vicki; Q: Who is the fourth member of the TARDIS crew? A: the butterfly-like Menoptera; Q: Who are the original denizens of Vortis? A: the moon Pictos; Q: Where did the Menoptera flee to? A: the Animus; Q: What is the name of the web that the Menoptera fled from? A: the ant-like Zarbi; Q: Who are the minions of the Animus? A: the larvae guns; Q: What are the Zarbi's living weapons called? Summary: On the planet Vortis, the Doctor, Ian, Barbara and Vicki are swept up in the struggles of the butterfly-like Menoptera, the original denizens of Vortis who were forced to flee the planet for the moon Pictos to escape the encroaching web of the Animus and its mind-controlled minions, the ant-like Zarbi and their living weapons, the larvae guns.