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.

Missing episode - only audio exists
 

The TARDIS arrives in 12th century Palestine where a holy war is in progress between the forces of King Richard the Lionheart and the Saracen ruler Saladin. Barbara is abducted in a Saracen ambush and the Doctor, Ian and Vicki make their way to King Richard's palace in the city of Jaffa.