Invasion of the Dinosaurs When the Doctor and Sarah return to London, they find it deserted, with prehistoric monsters roaming the streets. Death to the Daleks On the planet Exillon, the Doctor and Sarah join a human expedition who are in search of parrinium, a rare mineral. But the Daleks arrive, and want the parrinium for themselves. The Monster of Peladon Peladon is a source of trisilicate, but mining is being disrupted by apparitions of Peladon's sacred beast, Aggedor. Planet of the Spiders Reaching out across space and time, the giant Spiders of Metebelis III are searching for a rare blue crystal. Determined to thwart the Spiders' plans, the Doctor must face his greatest fear.