Invasion Quartet is a 1961 British World War II comedy-drama film directed by Jay Lewis and starring Bill Travers and Spike Milligan.

They abscond from their hospital and, together with an explosives expert suffering from mental illness, and a Colonel, thought too old to serve in the Army, make their way to France to destroy a long range German artillery piece.

Instead of pursuing all the debunking opportunities to their logical conclusion, they have fallen back on well-tried slapstick situations and hoary verbal gags.

Even on this level, the production is often forced and heavy and, from a generally ill-directed cast, only Spike Milligan's brand of zany humour emerges reasonably intact.

One might have had higher hopes for a script by Jack Trevor Story and John Briley, but what they serve up here is a preposterous tale about a ragtag outfit sent into Nazi-occupied France to knock out a gun aimed at Dover.