Tim and Mike in “Mettle”

I think I can guess.

This isn't the work of amateurs, Tim. Private Iron was taken apart by someone who knew what they were doing.

Right, and what happens now?

Well, if we can't fix him in time, we're automatically disqualified. Runners-up go through.

And they are?

[Gasps, as if realizing] Dexter and Cromwell!

Right.

... So who did this?

They did!