I don't think I even understand this myself!
Anyway, The Doctor and The Master find themselves in the Matrix universe and promptly find themselves plugged in to it.
They both "awaken" in there next to each other, without having been told about it.
What would happen? Who would figure out where they are first? Would they team up? Would they battle it out in there? Could they escape?
Basically, what would go down if The Doctor and The Master found themselves together in the Matrix?