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Ulla was the leader of the people of Corbo. When a green-skinned humanoid race attempted to invade his world with an army led by Lohk, Ulla sent his devil-birds to defeat and kill them. They also captured members of an Earth-Mars expedition to Corbo. The First Doctor arrived in search of the spaceship crew and prevented them from being executed. He tried to convince Ulla of his friendly intentions, but Ulla believed he was a spy and attacked him. The Doctor fended him off, but just then the green-skinned aliens launched another attack, allowing the Doctor and the spaceship crew to escape. Just before they left in the TARDIS, Ulla tried to attack the Doctor again, but the Doctor hit him with his cane. (PROSE: The Devil-Birds of Corbo)