|First appearance||"The Black Seal"|
|Last appearance||"The Black Seal"|
|Episode count||1 Episode|
|Played by||Rik Mayall|
A one-time cellmate of Prince Edmund whilst the latter was waiting to be eaten alive by snails, he had two friends: Mr Rat and, fortunately for Edmund, Mr Key, which Gerald made from his own teeth.
- In the closing credits "Mad Gerald" was credited as "Himself".
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