This is an expansion for the game Star Fleet Battles Captain's Edition. This is from the description on the back cover and contents: Includes all the rules needed to play: - The Mechad: a new star faring race of machines - Bolaar phaser capacitors - Electromagnetic Field - Power Distribution Nodes - Trans-Warp Missiles - The Distortion Cannon - Subspace Whips Historical background for the Mechad: - Mechad history - 3 historical scenarios Technical information including: - Ship descriptions for 25 Mechad units - The Mechad tournament command cruiser Also included: 24 Companion SSDs