That sound that happens when he's fires from his hands. I used to have a toy as a kid some 20 years ago, and it had a VERY similar sound, but I can't think of it. Anyone know what I"m talking about?

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OK!

I'm remembering it now! It was something where you turned the lights off, you flashed this light at your wall real quick, and then you could write with this special pen on the wall.

Good god what was it called???

It always sounded like the Ghostbuster proton packs charging.

FOUND IT!!!

Unfortunately they don't play the sound in the video... but I know this was it.

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I saw a leaked foley video on this. They were combining the sounds of squeezing guinea pigs and then blowing them up in a microwave afterward.

Oh yeah, The "Radiation 5000"! My brother and I used to have so much fun playing with this until the cancer got him.

I think some of it sounds like the flash on old film cameras after the flash go off and are then recharging for taking another picture.

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Yup, that's exactly it. I'm betting the flash in the Flash Screen had extremely similar technology. Hence the sound.

Haven't thought of that toy in YEARS. I was stoned and Iron Man was on, and I had to place that sound from my childhood.