Story & Art: Mac Raboy
Original run: 1956-11-04 to 1956-12-30
Summary: Emerging on the surface after his run-in with the Dactyl-Men of Mongo (read S-060 Journey South), a soaked Flash discovers that Dale and Zarkov have been abducted from their seagoing vessel, but also that the sea is filled with perfect reproductions of the ship.
This is merely the beginning of a bizarre chain of events as a baffled Flash is apprehended and brought to a city above the clouds where he encounters several identical copies of Dale, Zarkov and himself in an existence where nothing is quite what it seems...
(Source of summary: www.ipcomics.net)
All credits go to "spax".