Resource units

Resource units (RUs) are a pseudo-currency used at Earth Starbase for "buying" fuel, modules, ships, and crew. They represent the amount of resources available for The Captain to use in his fight against the Ur-Quan Hierarchy. Because RUs are simply a handy way for The Captain to keep track of resources, and not a true currency which is exchanged for goods and services, everything purchased at Starbase can be "sold" back at cost.

You can get RUs by bringing minerals back to Starbase and asking Commander Hayes to unload them. Rarer elements are worth more RUs.

You also get RUs by destroying enemy ships ("Spoils of War")