What do you call a mixture of two or more metals?

A copy of the 10-cent comic book featuring which hero's 1938 debut is now one of the most valuable comics ever? What mint-tasting compound comes from peppermint oil? A mission to help the homeless is named for which Lower Manhattan street, known as a skid row since the 1800s? What word can describe both a missionary and a cable box? Llanito, a mixture of English and Spanish, is spoken in which territory of about 30,000 residents? What is the mixture of flour and water or milk used to make pancakes called? What name is given to a mixed fruit-juice drink, Hawaiian for example? Which TV series had an episode about a thumbless alien and 1,700 pounds of walnuts?