Twins Juno and Vela, along with their dog Lupus, are the Jet Force Gemini , intergalactic police. Their mission is to stop the evil space bug, Mizar, from achieving his goal of galactic conquest with his seemingly-infinite army of Drones. They'll have to stop on multiple planets and assist King Jeff in rescuing his subjects, the Tribals.
Jet Force Gemini is a third-person shooter that focuses on making gigantic creepy bugs explode into gooey bits. The Jet Force Gemini team are given increasingly powerful weapons, including the Machine Gun, Plasma Shotgun, and Tri-Rocket Launcher, which fires three rockets with every shot. There's also the Fish Food, used to feed fish.
Each member of the team has their own special abilities - Juno can walk through lava without trouble, Vela can swim underwater, and Lupus can hover for short distances and travel through tight spaces. These abilities are required to fully access areas that were previously inaccessible. The team also gets help from Floyd the Droid, a hovering robot controlled by player two as a floating gun with infinite ammo when he joins the team.
The game includes three different multiplayer modes: Battle, featuring most options of an average First Person Shooter but with a third-person perspective; Target Shoot, a shooting gallery with a first-person view; and Racing, which includes some kart-like racing and old-school top-down racing games.