As a 1999 action-adventure shooter for the Nintendo 64, you join the Jet Force Gemini team—Juno, Vela, and Lupus—to stop the insectoid invasion led by Mizar across the galaxy. The core gameplay blends third-person exploration with lock-on shooting mechanics as you traverse planets to rescue enslaved Tribals and defeat Drones. A distinctive feature is the necessity of switching between the three characters, as each possesses unique skills required to solve environmental puzzles and progress through the diverse alien worlds.
The gameplay loop revolves around exploration, combat, and rescue operations. Players control one of three distinct members of the Gemini team—Juno, Vela, and their faithful canine companion, Lupus—each contributing unique abilities necessary for progression. The game features a dual perspective system: standard third-person exploration and movement, which transitions into a lock-on, over-the-shoulder shooting view when engaging enemies. This mechanic is essential for managing the swarms of insectoid Drones.
A significant component of the adventure involves planetary liberation. Upon arriving at a subjugated world, the primary objectives often include locating and freeing enslaved Tribals. These rescued individuals are crucial, as they often unlock new areas, provide essential upgrades, or grant access to previously inaccessible parts of the map. Success hinges on mastering both precise shooting mechanics against the Drone hordes and navigating complex 3D environments.
The integration of character-specific abilities is a defining feature. While all three members are capable fighters, certain puzzles and obstacles require the unique skills possessed by only one member of the team. This encourages players to strategically switch between characters to fully explore and complete each planet. For instance, different characters may possess specialized traversal methods or weapon proficiencies needed to bypass specific environmental hazards.
Progression is largely non-linear within the scope of individual planets, encouraging thorough exploration. Finding hidden areas and collecting power-ups enhances the team's capabilities, allowing them to tackle more formidable threats and eventually track down Mizar's central stronghold. The atmosphere balances lighthearted sci-fi adventure with intense, large-scale insectoid warfare. The game is presented as a complete, self-contained experience, originally launched for the Nintendo 64 platform.
The primary objective is to exterminate the threat posed by the galactic invader Mizar and his Drone army, which involves traveling across multiple planets to free enslaved populations, such as the Tribals, and ultimately confronting the source of the infestation.
As a main title originally released in 1999, this game does not feature any downloadable content (DLC) or post-launch expansions. The experience is contained within the original release structure.

An unreleased Game Boy Color version of the Nintendo 64 game Jet Force Gemini.

Jet Force Gemini Trainer and Co-Op Hack is a mod for Jet Force Gemini which adds cheats and support for co-op multiplayer for up to 4 players.