Part one 1920 to 1930

Part two 1931 The man who evolved / Edmond Hamilton The Jameson Satellite / Neil R. Jones Submicroscopic / Capt. S.P. Meek Awlo of Ulm / Capt. S.P. Meek Tetrahedra of space / P. Schuyler Miller The world of the red Sun / Clifford D. Simak

Part three 1932 Tumithak of the corridors / Charles R. Tanner The Moon era / Jack Williamson

Part four 1933 The man who awoke / Laurence Manning Tumithak in Shawm / Capt. Charles R. Tanner

Part five 1934 Colossus / Donald Wandrei Born of the Sun / Jack Williamson Sidewise in time / Murray Leinster Old Faithful / Raymond Z. Gallun

Part six 1935 The parasite planet / Stanley G. Weinbaum Proxima Centauri / Murray Leinster The accursed galaxy / Edmond Hamilton

Part seven 1936 He who shrank / Henry Hasse The human pets of Mars / Leslie Frances Stone The brain stealers of Mars / John W. Campbell, Jr. Devolution / Edmond Hamilton Big game / Isaac Asimov

Part eight 1937 Other eyes watching / John W. Campbell, Jr. Minus planet / John D. Clark Past, present, and future / Nat Schachner

Part nine 1938 The men and the mirror / Ross Rocklynne