Vespivorm

Vespiforms are insectoids that resemble giant wasps.

History
The Vespiforms arrived in 1926 and captured Agatha Christie for 10 days before leaving her and wiping all memory of their meeting. (DW: The Unicorn and the Wasp)Infromation from mulitple scources indicate that there may be only one Vespiform in this episode and that is is seeking revenge for something.