The Dead End Kids join the war effort in this feature-length version of the Universal serial Junior G-Men of the Air. The fiendish Black Dragon Society, led by the sinister Baron (perennial B-movie villain Lionel Atwill) plots to pave the way for an Axis invasion of the U.S.A. by destroying America's defenses. When their plans are discovered by the Dead End Kids, the gang is too suspicious of "the coppers" to ask for help. The FBI send in their Junior G-Men to stop the spies, but when one of the Dead Enders is kidnapped, the two groups must work together to smash the Black Dragons once and for all!