The Doctor: I'm not only from another culture but another planet. I am in your terms an alien.
This, the fourth Doctor Who story, is one that did not survive the BBC's purging of the archives in 1972-78. Originally seven episodes were made, and first broadcast in February-April 1964: none survive in the BBC's archives, and the entire story is one that is "missing believed wiped" See more...
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Plot hole: The junkyard at 76 Totters Lane seen in 'Attack of the Cybermen' was also in 'An Unearthly Child'. If you consider London's high land value, it is highly unlikely that an ownerless junkyard would still survive twenty-two years....the local authority would have long since issued a "compulsory purchase order."
Plot hole: Peri goes to a fair bit of trouble to bolt the door on the bath house when rescuing the Doctor. But when the Rani and the Master arrive, they simply open the door. Now this, in itself, isn't a mistake, as the Master has a special gadget for opening locked/bolted doors, yet both The Master and The Rani seem surprised that someone is in the bath house.