Nightclub entertainer Hap Smith has a new act since his former partner Chick Allen joined the army. With his lovely new female partner, Hap now plays a clownish parody of a soldier. When Chick organises a soldier show at Fort Benning, he realizes he needs his former partner's help—so, to get onto the base, Hap impersonates a hapless real soldier, but circumstances force them to prolong the masquerade, creating an increasingly tangled Army-sized SNAFU.
| Actor | Role |
|---|---|
 Dean MartinChick Allen | Chick Allen |
 Jerry LewisHap Smith | Hap Smith |
 Mona FreemanBetsy Carter | Betsy Carter |
 Don DeForeLieutenant Kelsey | Lieutenant Kelsey |
 Robert StraussSergeant McClusky | Sergeant McClusky |
 Richard ErdmanDogface Dolan | Dogface Dolan |
 Ray TealW.W. Timmons | W.W. Timmons |
 Marcy McGuireJulia Loring | Julia Loring |
| DDanny ArnoldPrivate Evans | Private Evans |
 Russ ConwayColonel | Colonel |
 Norma EberhardtCanteen Hostess | Canteen Hostess |