Because you demanded it! The team up of the century! The ultimate American icon meets the ultimate British icon! Who will triumph?
The original cover is Action Comics #454 (1975) and is by Bob Oksner. Morrissey and Sandie Shaw are by me.
Update: For similar (but better) Photoshop shenanigans check out The Brave and the Bold: The Lost Issues. Now this is a guy who knows his way around Photoshop and comics a lot better than I do.