Star Trek - The Original Series, Vol. 25, Episodes 49 & 50; A Piece of the Action/ By Any Other Name
"A Piece of the Action," Ep. 49 - Kirk and the U.S.S. Enterprise crew visit a planet that has developed a civilization based on a book a previous Starfleet crew left:Chicago Mobs of the Twenties. "By Any Other Name," Ep. 50 - The U.S.S. Enterprise is commandeered by the Kelvans, a group of aliens from the Andromeda galaxy who have assumed human form and plan to take over the Milky Way galaxy.