It showed the possibility of a Vietnam vet being crazed. Hawaii Five-O had already covered that theme in an early ep. Also, this stars Michael Ontkean as the vet. He is starring opposite pretty Kathy Cody in this. She had been on Dark Shadows ( as Carrie). She worked with Kate Jackson ( as Daphne).And Ontkean would also work with Jackson on The Rookies. Coincidence? See my postings on Ho Chi Minh's mass-murder in the 50s.