This suffers a similar problem to Mission to Galacton, it just makes the monster it's representing feel far too weak. Admittedly here the cyberman has just been fixed but it's still beaten by two kids and a model train set.

There is the threat of the children being upgraded, but the cyberman itself is still treated too robotically for me, being pieced back together and then repairing itself when it is.

That said, for a kids story, it's fun, I like that both kids get a bit to do as well and that they chose the girl to be the one that's more technically knowledgeable.