Takuya (Shinji Toudou) - who is of course secretly Spider-Man - has
premonitions about his impending death at the hands of a merman, so he
actually considers to not go out and fight the merman that is threatening
the countryside - but then his girlfriend Hitomi (Rika Miura) is sent on an assignment
to photograph the merman by her editor-in-chief, and to
protect her he decides to go after the merman anyhow and try to change his
However, Hitomi's editor-in-chief is really with the Iron Cross Army,
an evil alien organisation led by Professor Monster (Mitsuo Ando) trying
to take over the world, and the merman is one of their Machine Bem, a
monster that can change size at will.
Soon enough, Spider-Man is in mortal combat with the merman, and he
seems to die just like in his premonitions - when he sends a prayer to
Garia, his deceased alien mentor, and suddenly he is either saved or saves
himself from certain death (this part is left open to interpretation).
The story ends like all Spider-Man adventures: The merman
grows to giant size and Spider-Man calls in his giant robot
Marveller/Leopardon to fight and defeat the monster.
Of course, this episode, like all episodes of the series, is silly as
hell, but if you like men in rubber suits fighting and pretending to be
giant robots and monsters, this might be your thing anyhow, it's pure and
campy mindless fun.