Thunder is the stage name for the horse who is the official live animal mascot for the Denver Broncos football team. Thunder shares mascot duties with Miles, a human who wears a horse head mask atop a Broncos uniform.
Three purebred Arabians have held this role since 1993, all gray horses whose coats lightened with age until they turned completely white. Sharon Magness-Blake has owned all of them, and Ann Judge has been their rider since 1998 and trainer since 1999. As of 2022[update], Thunder has appeared in four Super Bowls. The original Thunder performed in Super Bowl XXXII and Super Bowl XXXIII; Thunder III appeared in Super Bowl XLVIII and Super Bowl 50. Thunder III also made appearances in Times Square and on television morning news shows in New York City as part of the pre-game promotion for Super Bowl XLVIII.
Thunder's duties as mascot typically include leading the team onto the field at the start of every home game, and galloping down the length of the field whenever the team scores a touchdown or field goal. Thunder and his rider also interact with fans before the game; the horse is particularly popular with children, who are allowed to pet him. The horses who have served as Thunder need to remain calm in situations that would normally frighten most horses, such as being in football stadiums with thousands of cheering fans, exploding pyrotechnics, cheerleaders waving pom-poms, and other spectacles common to National Football League (NFL) games. He routinely appears in parades, makes hospital and school visits, and attends various other public functions. He has been flown on airplanes, ridden in elevators, and appeared indoors at press conferences and banquets.
The original Thunder, later named "Thunder Sr.", was described as bold and courageous. He was a stallion registered as JB Kobask, a former show horse, who was team mascot for the Broncos from 1993 until his retirement in 2004. He continued making community appearances until his death in 2009. Thunder Sr. was succeeded in 2004 by "Thunder II", an Arabian gelding registered as Winter Solstyce. He had been the personal pleasure riding horse of Magness-Blake. Judge described him as being somewhat timid when he first began his role as mascot but eventually grew into it. He retired from mascot duties in early 2014 but appeared in the 2016 Super Bowl 50 victory parade in downtown Denver following the Broncos win over the Carolina Panthers. "Thunder III", a gelding registered as Me N Myshadow, was the understudy to Thunder II, and trained specifically for mascot duties beginning at age three when he was started under saddle. He began performing at preseason games in 2013. Although Thunder II was still active as team mascot during the 2013–14 season, Thunder III was sent to Super Bowl XLVIII because he was younger and better able to handle air travel. He is described as laid-back, preferring to doze off during games when not performing. Thunder III ran one last time during the 2020 season. Thunder IV, registered as Phantom JD, is the current mascot and began making appearances in the 2021 season.