by Shinichi Sekizawa saw a lot of evolution during its
development before it was finally canceled. Early concept
art indicates that at one point this film would have
starred the Gotengo and would have been a follow up
to the 1963 production Atragon.
More concept art for the project shows the α (Alpha)
class ship from The
Mysterians (1957), and another the SPIP from
in Outer Space (1959), although the name "Past
Future" is cited. However, by the time Sekizawa
submitted his first draft on October 3rd, 1966, the
craft had changed to a totally new design called the
Space Battleship that was done by Shigeru Komatsuzaki.
Reportedly, the project was going to be co-financed
by Henry Saperstein before it fell through. The work
would not be in vein, though, as Eiji
Tsuburaya took the concept and produced a show out
of it called Mighty Jack in 1968 through Tsuburaya
Productions, while Sekizawa would also reuse his ideas
for the ship in Latitude
Note: no finalized picture exists for the Space Battleship,
and the above design is merely Toho Kingdom's interpretation.