the thirty horror film that be best remember be always the like of dracula and frankenstein while and there a very good reason for that and but there be a number of small but nevertheless excellent production and and the invisible ray be certainly one of them . the plot be not particularly original and similar plot have be see many time before ( even way back in 1936 ) but the way that everything be put together be certainly very imaginative and director lambert hillyer have create a very nifty little original horror film . the plot focus on the good hearted dr janos rukh while a man who have discover a way to recreate the history of the earth . his discovery lead him to believe that there may be an unknown radioactive element somewhere in africa and so he set off along with a team of esteemed colleague to find it . however and tragedy strike while on the expedition and the good doctor end up become expose to the element while which make him glow in the dark and and also send him mad . the big draw of the film be undoubtedly the fact that it star the two big horror star of it day boris karloff and bela lugosi and and both give excellent performance . karloff really show what a good actor he be and his character have plenty of meat for karloff to impress with . bela lugosi have a role which be extremely different from what be use to see him in and and it a great performance from him also while it nice to see a bit of versatility from lugosi . the film do get off to a rather slow start while but thing soon start to pick up . the second half of the film be the best and that really when the film get excite and karloff get a chance to shine ( literally ) . the film do not put it focus on big special effect and largely relies on the action of the central character to keep thing interest while and it do work very well . the film remain interest throughout and boil down to a very decent climax that wrap everything up nicely . overall and the invisible ray may not be one of the very best horror film of the thirty while but it a very good one and come recommend .