Twenty-one years go, Randy Johnson made his Diamondbacks debut.

Randy Johnson traded to the Astros! The Big Unit has DOMINANT 2nd half in Houston!

Arizona Diamondbacks Greatest Moments: #4 Randy Johnson Strikes Out His 20th Batter - AZ Snake Pit

Randy Johnson opts for Arizona Diamondbacks logo on Hall of Fame bust - ESPN

A dove, a fastball and the day D-backs' Randy Johnson had PETA calling

Randy Johnson tips his hat to the crowd after striking out 20 batters : r/baseball

Total Command With an unprecedented April in which he was all but unhittable, the Diamondbacks' majestic Randy Johnson made his case for the title of the game's best pitcher - Sports Illustrated

Throwback Thursday: Diamondbacks have colorful history on Aug. 10

Twenty-one years go, Randy Johnson made his Diamondbacks debut.

SI Vault: Randy Johnson's path to 300 wins and the Hall of Fame - Sports Illustrated

Randy Johnson strikes out seven in return from back surgery, National Sports