- Complete Monster: Koquillion is also known as Bennett. To cover up a murder he committed, he murdered the crew of a human explorer ship, before wiping out the population of the peaceful planet Dido, unintentionally leaving only two survivors. He then lies to Vicki, the only other survivor of the ship and the daughter of one of the killed crew members, that the natives killed the crew, only keeping Vicki alive to corroborate his story. To maintain the illusion he disguises himself as Koquillion, and plans to convince the authorities to destroy the planet to removing all traces of his crime once they are both rescued. Upon the TARDIS arriving, he immediately tried to murder its crew as well, pushing Barbara off a cliff and causing a cave-in that buried the Doctor and Ian alive.
- Hilarious in Hindsight: The companions' comments about the Doctor "not getting any younger", before the writers had come up with the concept of regeneration. Also, that he can't just lose a companion and just carry on as normal - something which he would later regularly do. Of course, these were his first companions and one was his granddaughter.
- Retroactive Recognition: The deep voice that Bennett's actor Ray Barrett uses for Koquillion is the same one that he would later use for the Hood, his recurring villain on the puppet show Thunderbirds.
YMMV / Doctor Who S2 E3 "The Rescue"