Half-Life: Opposing Force is an expansion pack for the critically acclaimed first-person shooter game Half-Life. Developed by Gearbox Software and published by Sierra Entertainment, it was released in 1999. The game takes place during the events of the original Half-Life, where the player assumes the role of Adrian Shephard, a U.S. Marine Corporal.

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In Half-Life: Opposing Force, players take on the role of Corporal Adrian Shephard, a U.S. Marine who finds himself in the midst of a catastrophic event at the Black Mesa research facility. The game follows Shephard's journey as he navigates through the damaged facility, fighting against hostile alien creatures and military forces.

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