Actually I don't know if it is a "debut" role for Uri Geller, but I was certainly surprised to see him in it. He doesn't take a huge part, but the part he does take is pretty impressive. I agree partly with the previous reviewer, it is a disturbing film, but I have seen much more disturbing films. You need to brace yourself for the high pitched screaming that opens the film and there are some dead bodies being piled high as well, very much in bad taste. There are some unnerving scenes to the film, it's controversial as it features a mad doctor doing experiments on patients.
Actually it despite another review labelling it as disturbing, I found it wasn't half as disturbing as I thought it would be.
I suggest giving it a try. It is a cheap film, and if you find it too much for you then just turn off!
SPOILER WARNING!
There are things being planted in patients and we don't really find out what exactly those things are, but they are definitely not good for the patient.