Nemesis: The Nemesis DLC adds a few additional base game espionage operations to the game

Utopia: Advanced slavery options added, included Remans added as battle thralls, unique slavery options for the Orion, Breen

Synthetic Dawn: Two new races added to the game, the Cravic and the Pralor become playable

MegaCorp: The Orion & Ferengi are converted to megacorp empires with all the unique associated features.

Apocalypse: Planet Killer ships added to the game for the Undine, Scimitar, Xindi & Krenim

Federations: Unlocks the federation types included in this DLC. Note this doesn't impact the formation of the UFP.

Aquatics: The Chelarians have been added as a playable race and the Selkie are includes as a warp capable primitive

Toxoids: The Malons start with the relentless industrialists civic

First Contact: The new cloaking mechanics are unlocked for all races that could cloak throughout the history of trek. For users without the DLC we have a custom mechanic that mimics cloaking combat.

Galactic Paragons: Unique councillors, agendas and council rooms added for the major empires.