|Appeared in||Robin's Reckoning|
John Grayson was the father of Dick Grayson. He was killed in a circus accident, which caused his son to become Robin.
Together with his wife and son, John formed the Flying Graysons, an acrobatic team performing for Haley's Circus. They performed death-defying stunts without the aid of a net.
In an attempt to convince Mr. Haley to pay "insurance", Tony Zucco sabotaged the trapeze. During the show, in front of the entire crowd and young Dick, John and Mary fell to their deaths when the line snapped.