Kevin's alien warship
Caption: Enterprise returns fire
Caption: Kevin/Douwd's warship
The Enterprise-D responded to the planet's distress signal and, following its investigation, was later attacked by the warship, which crippled the Enterprise's weapons systems.
After destroying the ship, Picard deduced that the warship somehow responded to Kevin's wishes. Later, Picard learned that the ship was a product of Kevin's powers, and that Kevin was really the alien Douwd.