|Real name:||Capt. Walker Calhoun|
|C.O.P.S position:||Texas Sheriffs|
|Trademark features:||Wears a white and brown cowboy-styled uniform, with matching cowboy hat, has a red bandanna around his neck, and carries two service revolvers at his hip. He sports a black handlebar mustache.|
|Extra specialty:||A good horseback rider; vary charming and likable.|
|Significant episode appearances:|| The Case of the Pardner in Crime|
The Case of the Ready Room Mutiny
The Case of the Missing Memory
|Voiced by:||Len Carlson|
A friendly, smiling sort with a thick mustache and will never be found without his trusty cowboy hat and twin holsters. His modern-day revolvers occupy those holsters on a constant basis. Even when not on duty, the Southwest style of Sundown is quite noticeable, and he has quickly become a great asset to the C.O.P.S. force.
Notorious Texas bad guy Johnny Yuma escaped from the Texas State Prison and wants to rob The Silver Bullet Express. Johnny was once the partner of Sundown and he also plotted to take out his revenge on his former partner for putting him in prison in the first place.
When a series of raids went wrong because Big Boss kept on clearing the places he was in and leaving traps for the C.O.P.S., Bulletproof decided to go on vacation and left Sundown in charge much to the chagrin of the rest of the C.O.P.S. team and their boss Commissioner Highwaters. But things aren't exactly what they seemed to be.
When Sundown tried to go on vacation, he spotted Turbo & Koo-Koo trying to steal a clock. But just as he was about to catch them, a light pole hit his head and caused him to lose his memory. But while Sundown tries to figure out how to regain his memory, Big Boss (via Ms. Demeanor's run in with him) took advantage of his missing memory and plotted a robbery with his help.