"The Invaders," newest celluloid to glorify the democratic way of life, brings to mind that part from "The Walrus and the Carpenter" that goes: "Four other oysters followed them, and yet another four; and thick and fast they came at last, and more, and more, and more--all hopping through the frothy waves, and scrambling to the shore." This particular oyster tastes a little different from "Night Train," "Man Hunt," "Mortal Storm," and "Confessions of a You-Know-What Spy," but it is unmistakably of the same brand of sea food.

There's a new twist. The fifth column has been discarded for the real thing. No more of this kid's stuff about undercover men grubbing around in lower Manhattan. Here you have six men from a German U-boat battling through the wheat fields of Canada. There's plenty of action; lots of dialogue (though some of it sounds more like a made-on-purpose speech than anything a tobacco-chewing Canuck might sputter); and such fifth-magnitude twinklers as Laurence Olivier, Leslie Howard, and Raymond Massey perfume the bill. The only trouble is, there's no suspense. The audience knows that the six are marked men. All it has to do is sit back and gloat while six mouthsful of dust are bitten at pleasantly alternating intervals. The democratic shepherd and his sheep seem so safe from the pranks of these stupid little heilers. But it's fun, if you've had an exam and are feeling mildly sadistic.