This is fascinating stuff!
I recall Jules Feiffer describing how "all" comic-book magicians looked like Mandrake, and "all" of them had "a large brown sidekick NOT named Lothar".
Now, Mandrake's power is a rather devious thing. In most stories you read, he waves his hands, and things appear, bad guys are terrified, but the good guys know it was "just illusion".
NOT-- STRICTLY-- TRUE!!!
I remember in the late 70s seeing the
DR. STRANGE and
MANDRAKE tv-movies, and thinking they'd both missed the mark as far as authenticity went. The
DS movie seemed to have borrowed a lot from-- of all places-- the THEN-current
SPIDER-WOMAN comics (in that the old mentor sorcerer was English, not Asian, and, the villain was Morgan Le Fay). The
MANDRAKE movie, apart from screwing up the wardrobe (when did we ever see Lothar in a TUX in the comics??) seemed, to me, to have borrowed from
DR. STRANGE. But then, I read a reprint of
MANDRAKE's origin story, and it turns out, the reverse may have been true.
MANDRAKE's family was killed in a plane crash in the Himalayas, and he, the only survivor, was raised by an old mystic in a hidden temple not that far removed from the city seen in "
LOST HORIZON" or the Ancient One's temple in
DS. Mandrake learned REAL supernatural magic-- but on becoming a professional stage magician, decided that his main "shtick" would be "hypnoptism". And it turns out, his form of hypnotism is a cover for the fact that he has REAL supernatural powers. He creates illusions-- MAGICALLY. It's like a double-bluff. Most people have NO idea that he's using REAL magic!