The IKS Maht-H'a was a Klingon Vor'cha-class attack cruiser under Captain Nu'Daq that competed with Starfleet, Cardassians and Romulans in 2369 to assemble an ancient genetic puzzle.
The Maht-H'a appears in the Next Generation episode The Chase. After the death of Professor Galen, Picard takes up his search for DNA fragments scattered across many worlds, and finds that others are on the same trail.
Nu'Daq, commanding the Maht-H'a, has already taken a sample from Indri VIII and destroyed all life there so that no one else could. Believing the puzzle will yield a weapon, he joins an uneasy arrangement with Picard and the Cardassian Gul Ocett to pool their fragments, and comes aboard the Enterprise-D, where he tests Data's strength and tries to bribe him.
The search ends on Vilmor II, where the completed programme reveals a message from the first humanoids, much to the disgust of the Klingon captain.