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The Score: Had Symphony's dream actually happened, it would have been total victory for the Mysterons. Spectrum: 25 Mysterons: 6.
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Mysteron Reconstructions: None.
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Spectrum Losses: 1 Angel Interceptor (in Symphony's dream: 1 Cloudbase, 4 Angel Intereptors. Colonel White, Lieutenant Green, Dr. Fawn, Captains Scarlet, Blue, Ochre, Magenta, rey and Black, Destiny, Harmony, Melody and Rhapsody are killed)
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Collateral Damage: None.
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It is never explained what actually caused Symphony's jet to crash in the first place.
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It seems odd that "the most important position on the base" (ie the radar room) would be given to Captain Magenta who, under the slightest hint of possible annihilation, can't even count to four.
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While discussing the immenent attack on Cloudbase, Scarlet says that "it had to come". However, it's already been and gone once as the Mysterons tried to destroy Cloudbase with their crystal in "Dangerous Rendezvous".
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Captain Magenta calls Captain Scarlet "sir", but they are both the same rank.
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The sound effect used in this episode as the noise the Mysteron flying saucers make when they fire their weapons is the same effect used in The Avengers episode "From Venus With Love" (which aired just over a year before this episode), which was used to signal the death of an astronomer apparently by mysterious aliens.