Sword of Orion - Part 2

Part 2

The Doctor and Charley hear screaming and rush off to investigate, to find Kelsey lying before the TARDIS, battered nearly to death. As they try to stop the bleeding, Chev and Grash arrive, see them with the body and leap to the wrong conclusion. Kelsey dies while the Doctor is busy trying to convince Grash that they aren't responsible, and Grash contacts Jansen and requests authority to execute the Doctor and Charley on the spot. However, she realises that they can't be responsible for the brutal violence of Kelsey's death, and instead she orders Ike to take two spare suits over to the destroyer and bring the strangers back to the Vanguard. Ike does so, painfully aware that while Jansen is monitoring him he can't tell Grash that the Doctor and Charley are the strangers from the shop...

Back aboard the Vanguard, Ike and Chev take Kelsey's body to the sickbay while Jansen and Grash question the Doctor and Charley. Grash accuses them of being rogue androids from the Orion sector, but Jansen knows he's just grasping to explain the damage done to Kelsey's body. Vol then calls from the flight deck, informing them that he's picked up a transmission from the airlock reception area. Grash confiscates the Doctor's temporal tracker and sonic screwdriver, but the transmission continues, and its source begins to move. The Doctor spots movement in the darkness, but whatever it was has gone when he looks again; however, it has left scratches on the deck plates. Moments later, the lights fail in the reception area, and faults begin to spread throughout the ship, from the sickbay to the flight deck. Despite Grash's reservations, Deeva shows the Doctor to the nearest maintenance hatch, where they see that something has burned through it and the power cables beneath. And yet the life-support cables are untouched, suggesting that the intruder doesn't want the crew dead...

As the disruptions spread, it becomes obvious even to Grash that the Doctor and Charley can't be responsible. He and Chev remain suspicious, but Ike and Vol at least concede that Kelsey's wounds would have left his attackers drenched in blood. The Doctor has a theory to explain one of the mysteries, and when he examines the team's backpacks he finds scratches on Grash's. The intruder must have stuck to Grash's backpack on the destroyer, and dropped off in the airlock while he was concentrating on the Doctor and Charley. The Doctor suggests shutting down life support in the empty areas of the ship and diverting the spare power to the security systems to locate the intruder. Charley remains on the flight deck with Deeva and Grash, while Chev and Vol supervise the Doctor. The Doctor completes his work, and Vol locates the intruder; it's reached the stern of the ship, and is still transmitting the same signal he detected earlier.

Grash just wants to pack up and go, but Deeva has no intention of abandoning what could be the biggest haul in salvage history. Grash thus accuses her of unnecessarily endangering her crew, places her under arrest, and orders Vol and Ike to take the ship back to Garazone Central. But when they try to obey, they find that the intruder has reached the engines; the Vanguard isn't going anywhere now. Grash has no choice but to let Deeva and the Doctor cross over to the destroyer as they wish—but Charley must remain here as a hostage, and if Vol gets the engines working, Grash isn't going to wait for them to return. Once the Doctor and Deeva have gone, Ike finally gets the chance to tell Grash about his earlier encounter with the Doctor and Charley; but if they really are from Customs and Excise why haven't they reported Ike to the captain? Grash doesn't know, and he doesn't care; Charley poses a threat, and he knows how to deal with it and solve their engine problem at the same time. Ike and the reluctant Vol thus force Charley to accompany them to the engine room, where she realises that they intend to use her as bait to lure the intruder out into the open—and get rid of her in the process...

The Doctor suspects that there's more to Deeva, and her interest in the destroyer, than she's letting on. But another mystery gets answered first, for moments after he and Deeva board the destroyer, they are attacked by Kelsey's killer—a rogue Cyberman. To the Doctor's surprise, one blast from Deeva's gun is enough to destroy it, and she knows what it is even though the Cybermen have been entombed on Telos for some time. She claims to have studied that period in military history... which again raises the question of what such a well-educated and trained officer is doing in charge of a scrapship. The Doctor studies the dead Cyberman, and finds that its cyber-neural systems were damaged by faults caused when it was prematurely woken from cryogenic stasis. The Doctor now suspects that the thing on the Vanguard is a Cybermat—and as the signal from the Cybermat wasn't meant for this rogue, that implies that there are other Cybermen aboard. The Doctor and Deeva must find them and prevent them from waking...

But it's too late. The Cybermen are already awake. And they're reviving their Leader.