Omega, after centuries of exile in the anti-matter world, has got corporeal form in our universe again, as a Peter Davidson lookalike. We see him wandering Amsterdam. He stops to watch some sort of street show for children, and catches the eye of a young boy, who smiles innocently at him. Omega just stares impassively for a moment-even threateningly, the viewer fears. Then, suddenly, awkwardly, as if rediscovering a long-forgotten skill, his face twitches, and he clumsily half-smiles at the boy. He then looks up at the organ playing, as part of the street show, and we see him smile, as he seems to recall the innocent pleasure of music. The Doctor, though, in pursuit of him, knows Omega's human form is only a matter of time, and we see the newly-embodied man's joy at regaining proper life start to turn to horror, as he becomes slowly physically discovered. Finally, he is cornered on the jetty by the Doctor, who is forced to put him out of his misery and vaporise him with the blaster gun to save the rest of the universe from destruction as Omega returns to a state of anti-matter. I find this climax really poignant and moving. Omega is not just another barnstorming megalomaniac villain in the end. We pity him and feel pathos on his behalf.