The Halo series is a series of first-person shooter video games developed by Bungie Studios and published by Microsoft. So far, two games have been released, with a third in production. The games' setting is very similar to the earlier Marathon games by Bungie. They are renowned for their relatively deep storylines, use of vehicles in gameplay and their multiplayer mode. Supporting the storyline is a series of novels, which provide background information and flesh out the proceedings between the games.

The first Halo game was released for the Xbox game console on November 15, 2001. It was later ported to both Windows and MacOS X PCs.

The story deals with the adventures of the protagonist Master Chief on a ring-shaped space station, which he has to keep out of the hands of both enemy races in the game, Flood and the Covenant.

For more information, please see the main article about Halo: Combat Evolved.

The release date of Halo 2 was November 9, 2004. No ports have been released so far. It featured improved graphics, slightly tweaked gameplay and multiplayer via Xbox Live.

In Halo 2, Master chief battles the Covenant on earth, and later continues the fight on a second Halo (Installation 05). Meanwhile the Covenant slides into Civil War, with an Elite warrior called the Arbiter as a second playable character.

For more information, please see the main article about Halo 2.

No details are known about this game yet, but the cliffhanger ending of Halo 2 makes a sequel highly likely.

Its still in development, but its rumored release date is February 9, 2005, 2006, or later in the future for Xbox 2.

For more information, please see the main article about Halo 3.

Halo: The Fall of Reach is a prequel to the game, written by Eric Nylund. It provides background on the main character Master Chief and the beginning of the Covenant war.

Halo: The Flood is an adaptation of the Halo: Combat Evolved's story by William C. Dietz.

Halo: First Strike is the story between the first game and its sequel by Eric Nylund.

The Haunted Apiary is an alternate reality game which acted as a teaser to the release of Halo 2.