Electric Funeral (Black Sabbath)

They hadn't been fast enough. Ianto had been too clever, they'd been too unsuspecting. She'd taken them by surprise one morning after everyone had gotten in. It was like she'd planned it.

Jack had turned to the others, about to ask where Ianto was, when the power cut out, lockdown setting in. Fumbling for one of the torches stashed in various places, they had almost missed the quiet, metallic zzt zzt of approaching evil. Tosh had grasped her torch just in time, swinging it around to illuminate the source of the noise.

"Oh, god."

A jagged mound of sheet metal was lodged where the left half of Ianto's face had been. His right eye stared at them without emotion or recognition. Bits of metal and wiring protruded from his body. A crude version of the Cyberman helmet arced across Ianto's head, from one ear to the other. Large slabs of sheet metal covered his chest, wires poking out at various points, burnt bits of flesh hanging off them. His mouth had been torn open, the flesh of the cheek flapping wetly against his exposed molars.

"You will convert or be deleted." Ianto's accent was nearly gone. His voice sounded emotionless and digital. His eye stared unerringly at them, vessels in the white of it burst and flooding. The spaces between his teeth were black with blood.

Another metallic sound from behind them, and they whipped round in time to see Gwen go down, blue threads of electricity leaping across her body. Jack squeezed off a round, but the bullets ricocheted right off the metal casing of the Cyberman. An arm struck him from behind and flung him away like a bag of sand. The shell of Ianto and the strange metal monster faced the remaining two.

"Convert or be deleted."

"No." Owen's voice was defiant and spitting with fury. He stepped up to the Cyberman, determinedly not looking at the thing that used to be Ianto. "No."

"Delete." Blue electricity arced across Owen's body and he fell to the ground. Ianto's gaze did not waver or look down.

"You will open the door or be deleted." Tosh stared, wide-eyed at the two machines in front of her. She couldn't. She couldn't.

With a gasp, Jack came back to life. She ran to him. The Cyberman followed. Ianto didn't.

"You will be deleted." Tosh noticed irrationally that she could not tell if the thing had once been male or female. Jack began to talk, but she didn't register anything he was saying. Her fear had taken over and she could think of nothing but the blank eyes and Owen's body on the ground.

The klaxon of the cog door brought everyone back to the present. Ianto's horrible, grotesque shell had used his access codes to open the door, and he was walking away, out of the circular opening. Tosh could see blood soaking his back. It looked like he'd been stabbed. It was the last thing she saw.

"Delete. Delete."

Tosh was gone. Jack was gone. The Cyberman turned, surveyed the damaged hull of the Hub, and marched out of the cog door to the waiting corpse of Ianto.

"This world will be upgraded."