First appearance = Wonder Woman #228 (February 1977):
Red Panzer was the villain used in the story that transitioned the Wonder Woman title from the (then) "present-day" adventures of Wonder Woman on Earth-One to focusing on new stories of the Golden Age Wonder Woman on Earth-Two that were set during the early 1940s (at a time when the Wonder Woman television series took place during WWII). That lasted for about a year or so.