Going Underground is the fifth episode of Loonatics Unleashed. It first aired on October 29, 2005.
Lexi and Duck are out buying lunch for the other Loonatics when suddenly an earthquake occurs that sinks parts of Acmetropolis into the ground. The team finds that an evil genius named Dr. Dare plans to place the entire planet underground through a series of earthquakes with the help of the Jade Serpent Crystal. The Loonatics must stop him and return Acmetropolis to its original form.