Attack On Cloudbase is the 31st broadcast episode and 31st produced episode episode of British television series Captain Scarlet And The Mysterons.
Symphony Angel is shot down and crashes into the desert, where she soon succumbs to the relentless heat. Meanwhile, the Mysterons apparently launch an all-out attack on Spectrum headquarters - countless flying saucers surround Cloudbase and open fire. Destiny, Harmony, Melody and Rhapsody Angels engage the attackers their Interceptors, but are swiftly shot down and killed. As Spectrum's personnel is mercilessly decimated, Captain Scarlet attempts to repel the invaders in the only surviving Angel aircraft; but it seems that he is no longer indestructible, and he too is killed. Have the Mysterons finally won?