They are summoned by accident. Bad guy is trying summon Morgana and get the boys instead.

Yes, I'm thinking something similar....perhaps, perhaps.

And yes, I've already established that Albion is an alt-universe, so that'd be pretty easy to reinforce.

And very interesting thought about the Merlin crew coming in on a quest of their own... the exact details of your idea won't work with what I want to do, but PARTS of it could - and you've certainly got my brain working on some possibilities... so this is fantastic!

Thanks so much!