The original Thunder, later named "Thunder, Sr.", 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.
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.