Having successfully been a Guest GM before and having been inspired by excellent posts on using Marvel to power a fantasy-based system, I decided to try something odd. I sensed my normally tireless DM was getting burned out in Pathfinder, so I offered to take over for a few adventures. The group was pretty positive about a change of pace, but there was a lot of surprise when I said I was going to run the same characters, the same world, in campaign continuity with a different system.