Here is an interesting item that was for sale on eBay not long ago. Three boxes with action figures inside, featuring Kirby art on the boxes. It looks like Jack probably inked the illustrations and added color.Jack did illustrations for 4 toys in all. They were released by Mattel in 1976 as Big Jim's P.A.C.K. (Professional Agents -- Crime Killers). I'll post close-ups of the front and back to all four Kirby P.A.C.K. members next.