
Mass Effect 2 is an action role-playing video game developed by BioWare and released for Microsoft Windows and Xbox 360 in 2010, and for PlayStation 3 in 2011. The game features a variety of downloadable content (DLC) packs that were released from January 2010 to May 2011. The downloadable content ranges from single in-game character outfits to entirely new plot-related missions. Notable packs include Kasumi – Stolen Memory, Overlord, Lair of the Shadow Broker, and Arrival. The game's downloadable content was generally well received by critics and some packs were nominated for Best DLC at the Spike Video Game Awards.

Mass Effect 2: Arrival is a downloadable content pack developed by BioWare and published by Electronic Arts for the 2010 action role-playing video game Mass Effect 2. It was released for Microsoft Windows, PlayStation 3, and Xbox 360 in 2011. Set within the Milky Way galaxy during the 22nd century, Arrival follows the story of Commander Shepard, an elite human soldier who must stop an imminent invasion of a highly advanced machine race of synthetic-organic starships that plan to conquer the galaxy.

Mass Effect 2: Kasumi – Stolen Memory is a downloadable content pack developed by BioWare and published by Electronic Arts for the 2010 action role-playing video game Mass Effect 2. It was released for Microsoft Windows and Xbox 360 in 2010, and is included in the PlayStation 3 version of Mass Effect 2, which was released in 2011. Set within the Milky Way galaxy during the 22nd century, Stolen Memory follows thief Kasumi Goto and her efforts to steal a graybox that contains memories of her partner.

Mass Effect 2: Lair of the Shadow Broker is a downloadable content pack developed by BioWare and published by Electronic Arts for the 2010 action role-playing video game Mass Effect 2. It was released for Microsoft Windows and Xbox 360 in 2010, and is included in the PlayStation 3 version of Mass Effect 2, which was released in 2011. Set after the events of the Mass Effect: Redemption comic book, Lair of the Shadow Broker follows the story of information broker Liara T'Soni and her efforts to find an information dealer known as the Shadow Broker.

Mass Effect 2: Overlord is a downloadable content pack developed by BioWare and published by Electronic Arts for the 2010 action role-playing video game Mass Effect 2. It was released for Microsoft Windows and Xbox 360 in 2010, and is included in the PlayStation 3 version of Mass Effect 2, which was released in 2011. Set on a remote Earth-like planet during the 22nd century, Overlord follows the events of an experimental virtual intelligence that has gone rogue after a scientist interfaced his autistic brother's mind with it.

Mass Effect 3: Citadel is a downloadable content (DLC) pack developed by BioWare and published by Electronic Arts for the 2012 action role-playing video game Mass Effect 3. It was released for Microsoft Windows, PlayStation 3, and Xbox 360 in March 2013. The pack follows Commander Shepard and the crew of the Normandy SR-2 starship on shore leave, where they must uncover the truth surrounding a conspiracy against Shepard.

Mass Effect 3: From Ashes is a downloadable content (DLC) pack developed by BioWare and published by Electronic Arts for the 2012 action role-playing video game Mass Effect 3. It was released for Microsoft Windows, PlayStation 3, and Xbox 360 as a standalone download on March 6, 2012, and included with all retail copies of Mass Effect 3: Special Edition for Wii U. Set within the Milky Way galaxy during the 22nd century, From Ashes follows Commander Shepard and the crew of The Normandy as they investigate an attack on the colony of Eden Prime by the anthropocentric terrorist group Cerberus, where a Prothean artifact had recently been unearthed.

Mass Effect 3: Leviathan is a downloadable content (DLC) pack developed by BioWare and published by Electronic Arts for the 2012 action role-playing video game Mass Effect 3. It was released for Microsoft Windows, PlayStation 3, and Xbox 360 on August 28, 2012, with a delayed release in Europe on the PS3 platform set for August 29, 2012. The pack follows Commander Shepard and the crew of the SSV Normandy SR-2 starship as they investigate the truth about the origins of the Reapers.

Mass Effect 3: Omega is a major downloadable content (DLC) pack developed by BioWare and published by Electronic Arts for the 2012 action role-playing video game Mass Effect 3. It was released for Microsoft Windows, PlayStation 3, and Xbox 360 on November 27, 2012, with a delayed release in Europe on the PlayStation 3 platform set for November 28, 2012. The pack follows Commander Shepard and the asari pirate queen Aria T'Loak as they attempt to liberate the space station Omega from the anthropocentric terrorist group Cerberus. Omega expanded beyond the developers' original plan during its development cycle, both in response to a mandate of freedom by BioWare management and as a result of the development team's desire to develop the experience they wanted, and incorporates cut content from the main game.

Mass Effect: Pinnacle Station is a downloadable content (DLC) expansion pack developed by Demiurge Studios on behalf of Mass Effect franchise creator BioWare and published by Electronic Arts for the 2007 action role-playing video game Mass Effect. Pinnacle Station was released for the Xbox 360 and Microsoft Windows on August 25, 2009. The pack follows a squad led by Commander Shepard as they undergo special operations training on Pinnacle Station, a concealed military training facility.