to be added
- Eighth Doctor
- Marie Blekinsop
- Colonel Hulke
- Captain Letts
- Dr. Marter
- Organism 96
- Organism 96 was created by the Soviets.
- MI5 have been tracking Organism 96.
- Marie performs in Sounds of the Seventies, Eighties Extravaganza, and Hits of the Nineties.
- Several characters in this story share their surnames with Target Books novelisation writers: Colonel Hulke with Malcolm Hulke, Captain Letts with Barry Letts, and Doctor Marter with Ian Marter.
- The Doctor is dressed in his velvet coat and cravat. (TV: The TV Movie, AUDIO: Dark Eyes)
- The Doctor recalls how sound can be used against deep sea creatures. (TV: The Sea Devils)