After Worlds Collide (1934) is a sequel to the 1933 science fiction novel, When Worlds Collide. Both novels were co-written by Edwin Balmer and Philip Wylie. After Worlds Collide first appeared as a six-part monthly serial in Blue Book magazine. Much shorter and less florid than the original novel, this one tells the story of the survivors' progress on their new world, Bronson Beta, after the destruction of the Earth.

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.