Still, this development has really gotten me thinking about Mutant Future's ability to be a multi-genre game. Plane Shift leaves it wide open, completely up to the Mutant Lord, as to what is on the other side of the portals that are opened up. Want to have a session or two of WWII gameplay? Throw in an NPC mutant that the players are after who has the Plane Shift mutation - things get hairy and the mutant has no choice but to open a portal to escape... straight into the middle of war torn Europe! Of course, a party that does not have the Plane Shift mutation themselves would be at the mercy of the NPC to get back to their regular place in the space/time/dimensional continuum... unless some sort of epic quest could be performed to open a portal?
Mechanically, Mutant Future uses the Labyrinth Lord ruleset as its backbone. This means that the entire wealth of pre-3e D&D material ever published can be used with minimal adjustments. Take a look at that RPG bookshelf and imagine a portal opening into any of those great old adventures or supplements. Mutants Against the Giants. Mutants in the Underdark.
I had a brain flash while thinking about this sort of multi-genre gameplay; imagine an interdimensional A-Team of sorts (the players) who go on missions that their employer sends them on (the employer has Plane Shift as well as a unique mutation that allows his Mental Telepathy to extend across gulfs of time and space to discuss terms of service with clients in all the possible dimensions). As the party is hustling through the portal, their employer gives them the stern warning,
"Be back to this same place in one week exactly, as the return portal will be open for only five minutes."
This would be the perfect picaresque set-up, episodic by nature, confined to no genre. The characters would get to experience everything the wide world of D&D has ever offered. The many worlds are their oysters...