The gang journey to the North Pole, and drill a hole to find out "What's at the center of the Earth?"
| Actor | Role |
|---|---|
| AAndrew FranksRex the Runt (voice) | Rex the Runt (voice) |
| KKevin WrenchBad Bob (voice) | Bad Bob (voice) |
| EElizabeth HadleyWendy (voice) | Wendy (voice) |
 Steve BoxVince (voice) | Vince (voice) |
 Paul MertonDr. Dogg (voice) | Dr. Dogg (voice) |