Interphase, Part 1

More than a century ago, the USS Defiant disappeared with all hands into an interspatial rift deep in Tholian territory. Now the derelict ship has been seen drifting in and out of ordinary space, and the Tholian authorities have reluctantly agreed to let Starfleet retrieve the Defiant from the rift. Perhaps, at long last, the lost ship can be brought home and its valiant crew paid their final resp...