SINS OF COMMISSION while on a misssion to save the planet Lessenar from environmental collapse, the crew of the U.S.S. Enterprise is crippled by an emotional onslaught as the surviving aliens respond in anger and pain to the death of their comrade. Worf must overcome this alien influence and find the true killer with the destruction of the Starship Enterprise, the survival of Lessenar, and his Klingon honor hanging in the balance....