UNEXCOM for OpenXcom is a comprehensive total conversion mod that immerses players in a Cold War-themed alternate reality. Set in 1972, players assume control of the United Nations Extraterrestrial Combat Command, tasked with defending Earth during a pivotal conflict. The mod introduces a plethora of new features including realistic weapons, aircraft, and enemy units, enhancing the gameplay experience. Players can call upon superpowers like NATO and the USSR for support, utilizing an arsenal of new armaments and vehicles throughout their missions.

The mod also features a rich narrative supported by extensive UFOpedia entries that detail the game's backstory and the geopolitical landscape of the era. With support for English, Spanish, and Russian languages, UNEXCOM expands its accessibility to a broader audience. Players can engage in both air and ground combat with updated mechanics, including a redesigned tech tree and the introduction of satellite reconnaissance, making each encounter more strategic and challenging. The mod is designed for use with the OpenXcom Extended platform and requires a legal copy of Xcom: UFO Defense for installation.