Among the rescued humans, the Duke warns that he was scheduled to attend the first international energy conference in London that day, at which several high-level dignitaries will be in attendance. With the conference located in a building near the Thames, the Doctor fears that Broton will lure the Skarasen to attack the conference. U.N.I.T. races them to London but, before the Doctor can stop him, Broton activates the signaling device. The Brigadier kills Broton, and the Doctor recovers the device just as the Skarasen surfaces. The Doctor throws the device into the Thames, the creature eats it and, no longer a threat, returns to Loch Ness.