The Doctor's internal struggle with guilt and responsibility over Borad's past transformations and his moral duty to prevent Borad's tyranny.

The Doctor and Tekker confront each other in Borad’s empty vault as the Time Lord examines a Morlox gas canister linked to Peri’s current distress. Suspicion gives way to shock …

The cloned Borad bursts into the Inner Sanctum, overpowering Peri and seizing her throat with a mutated grip. In front of horrified allies, he threatens to kill her unless Mykros …