A U.S. Navy crew aboard a merchant marine ship battle Nazis.
| Actor | Role |
|---|---|
 Pat O'BrienChief Michael 'Mike' Mallory | Chief Michael 'Mike' Mallory |
 George MurphyLt. Thomas L. 'Tom' Sands | Lt. Thomas L. 'Tom' Sands |
 Jane WyattMyra Mallory | Myra Mallory |
 Jackie CooperJoe 'Babe' Duttson | Joe 'Babe' Duttson |
 Carl EsmondRichard 'Dutch' Kroner | Richard 'Dutch' Kroner |
 Max BaerCoxswain G. Berringer | Coxswain G. Berringer |
 Desi ArnazPat Tarriba | Pat Tarriba |
 Ray CollinsCapt. McCall | Capt. McCall |
 Franklin D. RooseveltHimself (Voice) | Himself (Voice) |
 Lee BonnellKovac | Kovac |
 Frank JenksSampier | Sampier |
 John McGuireJames Bayless (as John Maguire) | James Bayless (as John Maguire) |
 Frank FentonHodum | Hodum |
 Joey RayJames Dennis | James Dennis |
 Marten LamontLt. Cmdr. Murray - navy doctor | Lt. Cmdr. Murray - navy doctor |