Doctor and Bellal escape as the city's sabotaged controls begin to malfunction. The two Daleks inside are destroyed. When the bomb on the beacon explodes, all power is restored. The Daleks order the humans to load the Parrinium onto their ship. On leaving Exxilon, the Daleks intend to fire a plague missile onto the planet, destroying all life and making future landings impossible, so that they will have the only source of Parrinium. Their true intention for hoarding Parrinium is to blackmail the galactic powers to accept their demands; refusal would mean the deaths of millions. As their ship takes off, Sarah Jane reveals that the Daleks have only bags of sand while the real Parrinium is on the Earth ship, which is now ready to take off. Galloway has smuggled himself and his bomb aboard the Dalek ship; he detonates the bomb, destroying the Dalek ship before it fires the plague missile. Back on Exxilon, the City disintegrates and collapses, the Doctor sadly commenting that the Universe is now down to 699 Wonders. Production Working titles for this story were The Exilons and The Exxilons. The incidental music for this serial was composed by Carey Blyton and performed by the London Saxophone Quartet. This is one of two Third Doctor serials (the other being The Claws of Axos) to still have a 90-minute PAL studio recording tape. Missing episodes Part One of this story was chronologically the last to have its original master videotape wiped for re-use. This was initially returned to the BBC archive in 1981 through the discovery of a 525-line NTSC recording from Canada. Subsequently, two separate PAL recordings were discovered, including a high quality 625-line recording returned in 1991 as part of a shipment from Dubai. The other PAL copy had been returned to the BBC from Australia in 1985, although it had been edited and censored. Broadcast and reception Paul Cornell, Martin Day, and Keith Topping wrote of the serial in The Discontinuity Guide (1995), "A confused story with, for once, too much rather than too little plot. There really doesn't seem any need to have the Daleks in it at all. There are some adequate sacrifice scenes for Sarah to scream in, but the production seems tired and insipid". In The Television Companion (1998), David J. Howe and Stephen James Walker were more positive, even opining that it was the best of the