The Half-Life series of video games share a science fiction alternate history.

The Half-Life series includes a core set of titles which carry the main storyline.

Decay is unique within the Half-Life series as the only cooperative game-two players must work together to progress through the game.

His mysterious nature has made him an icon of the Half-Life series.

Both films were critically acclaimed, especially by Valve, the video game company responsible for the Half-Life series.

Reception to the transposition of the Half-Life series to an arcade setting was generally positive.

The following is a list of creatures in the Half-Life series.

Michael Shapiro provided Barney's voice in the games of the Half-Life series.

The popularity of the Half-Life series has led way to an array of side products and collectibles.

Changes to the story will not divert from, or alter, the overall storyline of the Half-Life series.