Whelan's Men

S18 E20: An outlaw gang led by a vengeance-seeking gunman named Dan Whelan invades Dodge City during Marshal Dillon's absence and terrorizes the town. With all of Dodge under the heel of the gang, and Whelan threatening to kill the Marshal on sight, Miss Kitty boldly challenges Whelan to a game of poker with Matt Dillon's life as the stake.