The Cybertek Prosthetic Leg was a piece of technology first seen being used by Mike Peterson a.k.a. Deathlok.
In "T.R.A.C.K.S.", Ian Quinn purchases a prosthetic leg from Cybertek and gives it to Mike Peterson, seemingly under orders from the Clairvoyant, as Mike had lost his right leg in a prior explosion and is now working for Centipede. John Garrett (briefly) gets a pair of these when he rebuilds himself entirely at the end of "Beginning of the End", which is the Season 1 finale.