Big Ear is a tracking station, named after Danger Mouse, designed to keep tabs on all the criminals in that part of the world. There are at least 6 in operation, located at equal points near the equator.
When Colonel K recieved a warning that the Big Ear on Eaves Drop Island, as well as the island itself, was in danger of being stolen by Baron Silas Greenback, DM and Penfold were dispatched to protect the station, only for DM to be captured by Dr Zook.[1]