Half-Life: Opposing Force Fan Trailer

Half-Life: Opposing Force is an expansion pack for Valve Software&science fiction first-person shooter video game Half-Life. The game was developed by Gearbox Software and Valve Corporation and published by Sierra Entertainment on November 19, 1999. Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S. Marine, one of the enemy characters in the original game. The player character, Adrian Shephard, is sent in to neutralize the Black Mesa Research Facility when a scientific mishap causes it to be invaded by aliens, but quickly finds that the Marines are outnumbered and slowly being beaten back by a second alien race and black operations units. — Song is "Maze" from the Half-Life: Opposing Force Soundtrack. Disclaimer: I do not own Half-Life. Half-Life and all subsequent material belong to Valve Software. Correction: Opposing Force came out on November 19, 1999, not November 18, 1999, as stated in the video.