When Worlds Collide is a 1933 science fiction novel co-written by Edwin Balmer and Philip Wylie; they also co-authored the sequel After Worlds Collide (1934). It was first published as a six-part monthly serial in Blue Book magazine, illustrated by Joseph Franké.
First edition published by Frederick A. Stokes
Edwin Balmer was an American science fiction and mystery writer.
The April 1927 Amazing Stories cover-featured a reprint of "The Man in the Room", a Luther Trant detective story Balmer wrote together with William MacHarg