It's probably no surprise that Invasion Quartet has four leading actors; what might be surprising, especially to the unwary war-film fan, is that film is a comedy. British funster Spike Milligan joins the sobersided Bill Travers, John LeMesurier and Gregoire Aslan; the foursome are undercover agents, travelling by train behind Nazi lines. It's all part of a plan to disarm a huge German gun that is aimed at the port of Dover. Just so the audience knows it's supposed to be laughing, the creators of Invasion Quartet pile joke upon joke by having the Nazis portrayed as bumbling buffoons. What works for Hogan's Heroes does not necessarily add to the effectiveness of Invasion Quartet.