Interstellar Marines is a science fiction first-person shooter video game that was developed by indie studio Zero Point Software until 2019.

Multiplayer was the first feature of Prologue to be built, doubling as both a tech foundation for future co-op missions and as a playable Early Access release on Steam.

The three envisioned acts after Prologue, collectively titled the "Trilogy", would have been narrative-driven campaigns spanning a continuous story arc set in "a realistic and unpredictable future where first contact with another sentient species is slowly becoming reality.

Zero Point Software claims that their co-op campaign would have featured tactical game-play, role-playing elements, open-ended level design, and a compelling sci-fi storyline.

[1] The player controls an individual Marine from a first person perspective with functions for walking, running, jumping,[8] crouching, peeking over cover,[9] leaning,[10] sprinting, and sliding.

Missions require following waypoints to objectives, which can include routing power or finding key cards to unlock sections of a map, while eliminating enemy CTRs.

Wargames is a family of PvP game modes supporting up to 64 players and offering survival sandbox gameplay.

Players start with only a loaded pistol and must scavenge weapons, ammo, and Combat Points from crates scattered across the maps.

Drop crates with a large number of Combats Points are deployed to designated zones at regular intervals.

Four demos were released on their website: Development of Interstellar Marines began in May, 2005 under the working title Project IM.

[22] A demo was completed in 2007 and Zero Point Software met with publishers at GDC in 2008, but, amid global financial crisis, investors later pulled out.

This mitigated the need for publisher backing whilst attempting to produce a game of higher quality than is typically released by independent developers.

[3] The game's release on Steam Early Access on July 2, 2013[28] almost completely superseded the initial crowdfunding model.