Known as a director of "weird" films (unfortunadely unusual means bad for many), Cronenberg is actually a serious studious of the human mind, not unlike Ingmar Bergman, and here he does it better than in any other of his films i have seen (Spider, The Fly and Videodrome- the last one about the influence of TV in society and the least introspective of them). Like in the pictures mentioned above, the very strange premise is a excuse to a deep analysis of the human psychology: what is identity? where is the line between love and obsession? how dependent of another person someone can be? where does one ends and the other begins? It can be seen the influence of Bergman, most notably Persona and The Hour of the Wolf, and arguably Hitchcock's Vertigo, and, as the masters, Cronenberg does not provide easy answers, or any answer at all. But no matter how great the director is, the film would not be successful without the talent of Jeremy Irons. An actor capable of very good performances even in bad films, like The Man in the Iron Mask, he delivers here one of the greatest performances of all time, playing two extremely complex characters without being over-the-top or inexpressive in any moment, confusing us of which is Bev and which is Elly when he is supposed to, and making clear who is he playing in the right moment. Dead Ringers is not an ordinary film, so is not for ordinary moviegoers: it is very complex, not commercial at all, can be very hard to look at it in some moments, and don't expect to feel good after watching it. But if that does not drives you away, i strongly recommend.