So they'd roll up different characters for each age/game type, or would the same set of PCs time-travel from age to age?
And how much adventuring would they do in each age/system? Just a one-off adventure, or enough to gain a few levels, or ... ? I ask because I'm wondering how much character continuity there'd be for the players if they're generating a whole new one that frequently..particularly if they happened to really like the character they'd generated in one of the systems.
If it was the same set of PCs time-travelling forward through the ages and getting re-skinned to suit each edition, that could really rock. (though it'd be a lot of work...)
Lan-"or the 3e guys could meet the undead remains of the 1e guys"-efan
Well, I never did get around to doing it - at this point in time, I can't remember what got in the way. But the general idea was to have all these earlier editions count as a sort of extended prelude to the main story, which was set in 4e.
Each edition would be spotlighted for only around three sessions - and would end with the group getting killed or otherwise failing in their quest to kill the big bad evil guy. And of course, each edition would highlight the world's changing history. Items the PCs held would later on become magical, and random events the PCs were involved in would become legends.
(I had this great idea about throwing a completely random, useless event at the PCs in the OD&D sessions, where the PCs encounter a bard in a tavern and a fight happens - with the PCs saving the bard from humiliation. As the ages progress, this story gets more and more epic, until 4e, where the PCs are hearing a tale about these metal-clad giants that fought off an army at this tavern, all to protect an alluring young woman of profound chastity or something. The gimmick being the PCs totally believe the story, but the players were actually THERE, and know the truth).
The PCs in each earlier edition would be getting double XP, and would probably start with enough XP to be put at around 3rd or 4th level. Another idea I had was to have the PCs start at around 2,000 XP in OD&D, earn double XP, and when we switched editions, they would keep their XP total. Once 4e started, everyone would be back at sqaure one, though each PC got to have one item from earlier adventures ("I have my 2e fighter's sword!").
If PCs really liked their old character, well, that's a bit rough. They could always play a descendant, though. But I figure this wouldn't be much of a problem, since the players would know what they were getting into before play started (the big problem for me would be the fact that we'd be learning a new system every month, basically).