Conversation so far:
What is Encounters with the Third Doctor?
The Third Doctor (Jon Pertwee) convinces the Master to stop this plan at the last minute.
Who encounters the Third Doctor?
CANNOTANSWER.
Who is The Master?
The Master, played by Roger Delgado.
Is there anything interesting about this article?
In The Sea Devils (1972), the Master is shown to be imprisoned on an island prison off the coast of England.
Why is he imprisoned?
He convinces the governor of the prison, Colonel Trenchard (Clive Morton), to help him steal electronics from.

Question: Who does he steal electronics from?
Self-contained rewrite: Who does the Master steal electronics from?