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There's a Malta Zeus boss called "A Titan Called Joe"
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There's an old sci-fi story; A Logic Called Joe; "logic" in that story meaning a computer.
Not sure if they've been mentioned :
In one PB mission, you have to get the Oxygen Destroyer, a weapon designed by the Japanese to destroy aquatic monsters and banned because of it's horrendous effects. That's the weapon used to defeat Godzilla in the original movie, the one that turns things into skeletons.
Theres a mission, Rescue Dr Steven Fate ( think that's the name ) whose name suspiciously resembles Dr Strange and whatshisname Fate from DC. He's described as often being mistaken for a master sorceror, despite being "a skilled surgeon and nothing more." There's this cute bit when you approach that goes something like this :
Doctor : "Help me <heroname> I can't defend myself, for I am a skilled surgeon and nothing more."
Boss : "Get the hero ! Ignore the Doctor, he's no threat to us; he's a skilled surgeon and nothing more. "
Villain : "Yes, he's no use to our plans; he's a skilled surgeon and nothing more."
And after you lead him out, the Doctor thanks you for helping him when he couldn't help himself, because "I am a skilled surgeon and nothing more." Note that Doctor Strange was a surgeon . . .