Once again, the Worldwide Evil Empire, led by mastermind Gemini, is up to no good and after a brief training mission, Kim Possible and her side-kick Ron Stoppable are going to kick some WEE butt.
Kim Possible: Global Gemini contains 17 missions that are a mix between story-advancing missions and WHAT missions. WHAT missions are simulators that Wade opens up for Kim to train on new gadgets and improve her general skills. These WHAT missions (WHAT stands for Wade's Holographic-Artificial Training) occur throughout the game and appear whenever Kim needs to learn how to use a new gadget (like her mini-chute).
In these missions, you have a limited amount of time to get from one end of the level to the other. If you die in the level, you do not lose any lives, but you are immediately knocked back into the level-selection screen.
The other levels will take you from the highest mountains to the driest deserts in order to hunt down Gemini, Adrena Lynn and Motor Ed, the three main villains in this game. You will also collect various outfits for Kim. These don't really affect your character's performance or anything, but those people who don't consider a game beat until they have gotten all the goodies will want to keep an eye out for these.
Global Gemini also adds multiplayer functionality (Kimmunicator was just one-player). You and a friend can go head to head in races on everything from mopeds to snowboards. These are fun little races, but if you don't have a friend who has the game then you can't play and aren't really missing all that much anyway.