Plot: The episode is set in what was the Mediterranean sea in 5 million years time. It features four species: (1) Cryptile, a lizard with a sticky frill to catch flies which it can then lick off at its leisure; (2) Scrofa, a descendant of the wild boar which has developed spindly legs to allow it to live on the rocky islands in the desert; (3) Gryken, a descendant of the pine marten which hunts Scrofa in the cracked rocks of the landscape; (4) brine flies (live-acted)