We watch "The Age of Steel" (Series 2, Episode 6), the second part of the re-introduction of the Cybermen to the Doctor Whoniverse, where the Who Crew defeats the bad guys at the expense of the lives of alt-Jackie, Rickey and Old Lady Matrix. Also Mickey grows a pair and stays to become the hero his alt was all whilst alt-Rose's-dad denies he's the baby daddy. And the Doctor does some stuff.