AJ stands for Andrew Jackson, our 7th president. His reputation for toughness earned him the nickname "Old Hickory." A hero of the War of 1812, Jackson has appeared on the $20 bill since 1928.

Did you join the Kid Kred saga in the middle? Catch up with the characters two ways.

Go back and read from the very beginning or get to know the characters here using this handy guide.

BTW, there's no harm in doing both!

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