I think the cameos become way more frequent in later years (eventually there's a mecha-Thatcher in Robo-Hunter, and of course Ronald Reagan has an extensive run on Strontium Dog). In '77 I like this little cameo by the Muppets when MACH Zero was introduced. It sets a chilling scene. The "I like the Crumpets/Grumpets" chest tattoo would quickly disappear!