Season: 1
Original Airdate: 10/31/1987
Writer(s): Michael Halperin
Director(s): Cliff Bole
Guest Stars
John Durbin as Ssestar
Colm Meaney as First Security Guard
Kavi Raz as Singh
Stardate: 41249.3
Synopsis: While on a mission to transport emissaries of two warring races to Parliament for negotiations, the Enterprise encounters a strange cloud consisting entirely of energy. As they pass, a bolt of energy strikes Worf and passes from crewman to crewman, killing one crewman and eventually taking over Picard’s mind.