Just wanted to share an idea I had for a pre-faction war (don't like FW) Planescape campaign inspired by the sci-fi show Farscape.
The characters are all convicts, for whatever reason, who are being transported by the Harmonium to a maximum-security prison on Carceri. They are going by way of The Nemausian, a sealed ship capable of sailing, flying, submerging, and passing through almost any environment on the planes unharmed.
That is, until the ship is attacked en route by Githyanki corsairs. When the dust settles and the Harmonium guards have been killed in the fighting, the PCs can escape and deal with the remaining pirates before commandeering the ship through it's gear spirit core, Torque Centrix Oculary Prime.
Thus, they are left with a damaged ship in the middle of nowhere with a bunch of other convicts for a crew whilst being hunted by both the Harmonium and the githyanki.
I'd really love to run this game with James O'Rance's Planescape Storyteller rules. I've been itching to run a Planescape game for the longest time. Anyone have any thoughts on this idea?
One thing: it should probably the Mercykillers, not the Harmonium. The Mercykillers already have a prison in Carceri (the Vault in Colothys; although technically a Hardhead is in charge of it, the Mercykillers are the ones who ship prisoners there). The Mercykillers are the ones in charge of imprisoning people. The Harmonium only arrest them.
The Harmonium arrest, the Guvners try, the Mercykillers punish. That's the Triad of Law in Sigil.
Of course, if they're arrested in some Harmonium-controlled area other than Sigil, the Harmoniums might imprison as well. But they're much more likely to take prisoners to Arcadia for reeducation than to mess around with Carceri.