Late 70s early 80s movie. 2 kids one boy one girl get abducted by aliens. Years later a man becomes a serial killer for those aliens has a green glowing alien knife. Kills and cuts up the bodies and throws them into this cave hole that’s space/time vortex. The killer I think kidnaps the little girl, now a grown up and the boy, now a man, confronts the killer. The killer stabs the man with the knife and it doesn’t hurt him cause he was abducted and changed when he was little. I thought the killer was portrayed by Tracy Walter. Not sure. Thanks.
“The Return”(1980). starring Jan Michael Vincent and Cybil Shepard.
http://www.imdb.com/title/tt0081421/?ref_=nm_flmg_act_50
Here is a clip from Youtube which shows most of your description.
Okay, I nailed this one, yes?
YES, You are the man, for years ( im 41 today ) I have been wondering the name of that movie. THANK YOU
Thank you for the confirmation, I’m 45 and remember seeing this bizarre movie on a late Saturday night from my youthful days!
You did nail it Livinghead!