Notable contributors to Crack Comics included Alfred Andriola, George Brenner, Gill Fox, Jack Cole, Paul Gustavson, Klaus Nordling, and Art Pinajian.
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The Clock: moving over from Feature Comics, George Brenner's the Clock was the cover feature of Crack Comics #1, alternating cover appearances with the Black Condor until issue #19.
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Cartoonist George Brenner became editor of Crack Comics with issue #31 (Oct. 1943) (Cronin having left the post in Feb. 1942), a few issues before Brenner's character The Clock stopped appearing in the book's pages.
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Ned Brant: a regular feature from issues #1–25 (Sept. 1942), the sports-related stories were syndicated newspaper strip reprints by writer Robert Zuppke and artist Walt Depew.
The Clock: George Brenner's masked crime-fighter was featured was carried over from Feature Funnies, running in every issue of Feature Comics from #21–31 (Apr. 1940), when he moved over to the new Quality Comics title Crack Comics.
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Gustavson also wrote/drew characters including Magno (premiering in Smash Comics #13, 1940); the Spider (premiering in Crack Comics #1, 1940); the Jester (in Smash Comics); and Rusty Ryan (in Feature Comics), whose uniform strongly evoked that of Captain America.