The ultimate weapon of the U.S.S. Discovery isn't its phasers or torpedos, but rather its unique propulsion system: the spore drive. Now the Discovery has accidentally slipped into the mirror universe where the previous I.S.S. Discovery has been destroyed. Several members of the I.S.S. Charon would like to capture the Discovery to use it for their own aims.

In Star Trek: Discovery – Black Alert, players divide into teams, and each team represents key members of either the U.S.S. Discovery or I.S.S. Charon crew. Players take turns activating locations on their ship, navigating through the network, and attempting to accomplish missions. One crew is trying to return home, while the other wants to capture their ship. Which team will emerge victorious?

— description from the publisher

In Star Trek: Discovery - Black Alert, the U.S.S. Discovery has slipped into a mirror universe and now they are being pursued by the I.S.S. Charon. This is a team vs. team game where two crews are trying complete missions. The crews will finish these missions by activating locations on their respective ships and navigating their ships across the mirror universe's board. The goal of the U.S.S. Discovery crew is to make it back home safely, and the I.S.S. Charon crew will be seeking to capture the U.S.S. Discovery so they can use the ship's spore drive for their own purposes.

— description from the publisher