In the mirror universe, Wesley Crusher was the son of Beverly Crusher and the pirate Jack Crusher. Apparently orphaned, he was forced to take care of himself. He formed a friendship with the archeologist Jean-Luc Picard. (TNG novel: The Worst of Both Worlds)

Dark Mirror continuityEdit

In the Dark Mirror universe, Wesley was an Ensign on the ISS Enterprise-D. He hated Captain Picard for the death of his father, and made an attempt on his life. As per the novel Dark Mirror by Diane Duane, Wesley Crusher is a commissioned Starfleet officer aboard the I.S.S. Enterprise, ICC-1701D. Like his counterpart, he is often stationed at the CON. When Riker lets him leave the bridge, knowing what Crusher will attempt, Crusher chases down Captain Picard and tries to assassinate him, but fails. What nobody in the universe knows, other than the crew of the USS Enterprise, is that this is not the regular Picard, but the Jean-Luc Picard from the Federation universe. Picard's henchmen send Crusher to the agony booth, where he does a spell until Jean-Luc Picard orders him confined to quarters. Jean-Luc realizes that Riker would have been happy to have Picard dead with minimal risk to Riker himself. Wesley's fate after this incident is unknown, but if it is realized that Wesley attacked the mirror Picard after that man made the mistake of going around unguarded, that Wesley probably is entitled to continue serving.

ISS Enterprise-D personnel
Reginald Barclay • Beverly Crusher • Wesley Crusher • Eileen Hessan • Geordi La Forge • Jean-Luc Picard • William Riker • Deanna Troi • Worf