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Danny McKay is the son of Windy McKay and Mrs. McKay.

Danny was too rambunctious for his parents, always yelling, running, and getting into trouble. His parents never had a moment's peace with him. So, they gave him medication to calm him down, which put him to sleep for two days. This led to his father, Windy, getting distracted at the Zenith Power Plant and missing an almost catastrophic malfunction. Radioactive Man met Windy at the power plant where Windy told him all about Danny. Radioactive Man then took Windy to the McKay house so he could inspect Danny.

Danny was talking in his sleep and mentioned "Moon-Cow", which led Radioactive Man to realize that Danny was in another part of the galaxy, in the uncharted space between a grown-up's world and a child's dream. Radioactive Man then flew off to find Danny, leaving the McKays confused. Radioactive Man eventually found Danny on a meteor. Danny, upon realizing that Radioactive Man wanted to take him back home, tried to run off. Radioactive Man caught up with him and told him that he would show Danny places that Danny hadn't dreamed of yet...