When I was a kid, John Agar's glazed over radioactive eyes and the floating transparent brain of the film's title really gave me the willies, I tell ya. This is still a wonderful silly movie that benefits from being short, with the monster introduced early on. Agar is good, contorting himself in pain pretty convincingly as the monster enters and leaves his body, and he's got the megalomanical laugh down pat. The special effects are primitive, especially when the alien monster is forced to assume his real shape and reveals himself to be a rubber blob bouncing around on a wire, but heck, you were expecting Industrial Light and Magic, maybe? Everything is low budget: small cast, stock footage, a nuclear research lab with no equipment, and a set that consists of the desert and someone's suburban home. And what other film mentions the "fissure of Rolando"? The extras on the DVD are virtually non-existent, consisting only of chapter search and the theatrical trailer. Biographical info of the performers, especially the supporting cast, would have been welcome. If you like sci fi B-movies, this certainly fits the bill perfectly. The transfer to DVD is excellent.