TARDISodes
Season 1, Episode 6: Prelude to the Age of Steel
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A video from John Lumic orders the "upgrade" of humans to Cybermen to commence around the world. This is followed by an animated diagram of a "Skin to Metal Upgrade" and a Cyberman being instructed by Lumic to "delete" all incompatible humans.
All Episodes - Season 1
Episode 1
Prelude to New Earth
Episode 2
Prelude to Tooth and Claw
Episode 3
Prelude to School Reunion
Episode 4
Prelude to the Girl in the Fireplace
Episode 5
Prelude to Rise of the Cybermen
Episode 6
Prelude to the Age of Steel
Episode 7
Prelude to the Idiot's Lantern
Episode 8
Prelude to the Impossible Planet
Episode 9
Prelude to the Satan Pit
Episode 10
Prelude to Love & Monsters
Episode 11
Prelude to Fear Her
Episode 12
Prelude to Army of Ghosts
Episode 13
Prelude to Doomsday