Jensen Ackles's acting in Supernatural brought us unforgettable emotional moments. His performance when Dean lost his memory and identity due to a witch's curse was so sincere that it reminded us of the scary reality of Alzheimer's disease. When Sam died, Dean's raw grief portrayed by Ackles was heart-wrenching. Ackles also shone in season 4 when Dean returned from Hell, breaking down in front of Sam. Ackles is an integral part of Supernatural's continued success and popularity.