On page 1 of the story, SHADO Control tells Skydiver 1 that
the approaching UFO has E.T.T. seven minutes. ETT=Estimated
Termination of Trajectory.
On page 2, panel 9 of the story, the SHADAIR plane is a
Kingfisher Helicopter as seen in
"Ordeal".
On page 3 of the story, a different kind of alien pistol
than seen before is depicted.

Page 4 seems to state that there is a world navy in place on
Earth at this time. The year of the story is not given,
however.
"The Alien Ally"
previously revealed a largely central world government
(except for a few holdout countries) in the 1980s of the UFO
universe.
The world navy is testing a new fully sub-marine nuclear
tactical missile called Barracuda.
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Episode Studies