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Under the Brigadier's orders, the Third Doctor took Albert to a London zoo. The boy stole a part of the TARDIS dematerialisation circuit from the Doctor's pocket and used it to transport himself into the animals' cages, but when he entered the tiger's cage, it caught his hand in its mouth. The Doctor entered the cage, then instructed Albert how to use the circuit to free himself. (AUDIO: Walls of Confinement)