One of Bela Oxmyx's gunmen on Sigma Iotia II, who meets the Enterprise landing party with a submachine gun in 2268 and is later fooled by Kirk's invented card game.
Kalo appears in the second-season episode A Piece of the Action. Iotian society has modelled itself on a book about the Chicago gangs of the 1920s, and Kalo is a typical product, a sharply dressed hood who takes Kirk, Spock and McCoy at gunpoint to his boss.
Left to guard the three in a warehouse, he is drawn into a game Kirk makes up as he goes along. Fizzbin has rules that change with the day of the week and the time of night, and Kalo becomes so absorbed that Kirk is able to tip the table over on him.
He is still on Oxmyx's payroll when Kirk forces the bosses into a single syndicate. Kalo was played by Lee Delano.