The Frobisher reference article from the English Wikipedia on 24-Jul-2004
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Frobisher

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Frobisher is a penguin who appeared in the Doctor Who Monthly comic strips (Sixth Doctor Who) of the 1980s. Despite not being strictly canon, it is considered an important part of the Doctor Who mythos.

Audio CD The Maltese Penguin featured private-eye and talking penguin Frobisher's return. Frobisher was in another CD called The Holy Terror.