All of the first 43 issues of Zukunftsromane belonged to the subseries Jim Parkers Abenteuer im Weltraum (adventures in space) written by Alf Tjörnsen and other authors.
Apparently caused by the success of Moewigs series Perry Rhodan 1962 a new subseries started within Zukunftsroman #320 to #352: Mark Powers - Der Held des Weltalls (hero of space, Freder van Holk and others).
The volumes #26/28/30/32 of Großband were subtitled "Kriminalroman aus der Welt von morgen" ("detective story from the world of tomorrow").
1955 Pabel issued "Utopia Sonderband", a magazine with short stories and science fiction related articles.
There was also a series by this publisher originally called UTR Luna Utopia Taschen Roman (10 paperbacks / 3 dime novel formats, 1957–59).