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On 11 August, the following important behind-the-scenes events were known to have occurred:
- 1969 - The Monsters was given a new name — The Silurians — and an extra seventh episode.
- 1969 - On the same day, assistant script editor Trevor Ray sent a revised version of episode one of The Carriers of Death to script editor Derrick Sherwin, who was unpleased with David Whitaker's work. A meeting was held two days later to discuss the serial.