If anything this article firmly establishes the great influence of writer Richard Matheson. Besides his huge amount of work for Twilight Zone, there are his other books and movies such as I am Legend, Incredible Shrinking Man, Somewhere In Time and many others.
The questions of "inspiration" and "influence" or "ripoff" is something that was gotten into in anotrher list article awhile back. What makes something into one of the other? Do you always have to acknowledge where you got the initial idea. Writer Dan O'Bannon got alot of inspiration from some SF short stories and movies when he created Alien. Was he ripping off or did he use their ideas as springboards for his own original take?
And most famously was James Cameron blatanlty ripping off Harlan Ellison's Outer Limits episodes Soldier and Demon With A Glass Hand or was he inspired by them for the original Terminator. The fact that he admitted the influence in an interview and Ellison's litigious nature seems to have answered that question at least from a legal standpoint.
I'd go more for the "inspiration" side than "ripoff". I don't think most creators deliberately scheme to steal somebody's work. I think sometimes you just love a particular piece so much it rolls around in your head and you think, "That's so cool! But I wonder if they went this way with it? That could be a great story, too." And then they are off. Most of the time it comes down to how it's executed.








Only 4? They sure missed a few. The late-70's movie "Magic" about a ventriloquist (Anthony Hopkins) who's dummy tells him to kill was ripped off from an early episode of TZ. The current movie "The Box" was an episode of the 80's version of TZ. If it wasn't so early in the morning, I could think of more examples.