Mr. Cullen is a resident of Griffin Rock, and an amateur astronomer.
Mr. Cullen attempted to launch a rocket, only to have it crash into power lines, resulting in a rescue team call out.
Mr. Cullen was about to step into his rocket when Heatwave accidentally jumped on it and sent it flying. Fortunately Mr. Cullen was thrown clear and landed in a chair.
- Mr. Cullen's house is presumably the one with the rocket next to it visible in the pan of Griffin Rock that can be seen in the title sequence.
- He is presumably named after Peter Cullen.