 On board Deep Space Nine , Captain Benjamin Sisko ( Avery Brooks ) is being queried by Department of Temporal Investigations agents <unk> ( Jack <unk> ) and <unk> ( James W. <unk> ) . The Captain explains that he was on the USS Defiant , returning from <unk> space with the <unk> <unk> of Time . They had picked up a <unk> on the way , a human called Barry <unk> . Suddenly the ship found itself some 200 light years away from its previous location and a hundred years in the past , near Deep Space Station K7 and found the USS Enterprise in orbit . They discover that the <unk> @-@ <unk> was Arne Darvin ( Charlie Brill ) , a Klingon agent who had previously been caught by Captain James T. Kirk ( William <unk> ) on K7 whilst trying to poison a shipment of grain . 
