What substance makes the time machine work in the film "Back to the Future"?

Plutonium
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In the movie "Back to the Future", what was the name of Marty McFly's band?
The Pinheads
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In "Back to the Future", what did Marty say when things got difficult?
Whoa This Is Heavy
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Which 1989 movie has this as it's tagline, "Getting back was only the beginning."?
Back To The Future Part II
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In "Back to the Future", what is the name of the mall where the time-traveling begins?
Twin Pines Mall
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In "Back to the Future", what color was Marty's Calvin Klein underwear?
Purple
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