- "I call it Bonnie.""Why?""Because it turns around, and every now and then it falls apart."
- ―Tyler and Mari Tann
The Ultrasound Frequency Resonance Oscillator "N" (also known as "Bonnie") is an imaging device used for analyzing underground cave systems by the team at Kraken Base. It is later used by Cywren Caster as a seismic weapon, with a few modifications, against the Undead.
- Bad Planet (First appearance)