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The role was recast with Sylvester McCoy , but falling viewing numbers , a decline in the public perception of the show and a less-prominent transmission slot saw production ended in 1989 by Peter Cregeen , the BBC 's new head of series .
 Sylvester McCoy, Peter Cregeen, BBC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sylvester McCoy, Peter Cregeen, BBC