Originally Aired: October 16, 1960

Gunsmoke #445, "Crack-Up," Matt Dillon returns from a week in Abilene to find trouble brewing in Dodge City. While getting a haircut at Peters' barbershop, a stranger pulls a gun and demands immediate service, ordering the unarmed Marshal out of the chair. Dillon refuses to back down, calling the gunman's bluff and forcing him to leave. Chester later identifies the man as Nate Springer, a notorious paid killer known as the most nerveless gunman alive—a man of ice who never shows fear.

Springer's presence in Dodge puts everyone on edge, including Doc Adams, who finds himself confronted by the paranoid killer at Delmonico's restaurant. When Springer threatens Doc for simply looking at him, Matt intervenes and warns the gunman that he'll jail both Springer and whoever hired him once he discovers the target. But something seems to be happening to the infamous killer—his legendary composure appears to be cracking, and Doc notices the man of ice is starting to melt. Matt knows whatever is happening to Springer isn't good, setting the stage for a dangerous confrontation.