Originally posted by Marcus Rowland:
The trouble with any Doctor Who crossover (and believe me I've thought about it many times) is that you end up marginalising either Superman or the Doctor.
I can think of one possibility here: The villains have Kryptonite. Do we know what powers the Cybermen? If not, we could posit that they are powered by Kryptonite, in the same way as Johnny Corben's arm.
Clark would be able to help from a distance -- He could use his super hearing and vision, for example, but he couldn't get too close to them.
cheers,
Lynn