|Affiliated with:||The Musketeers|
|Appearance:||The Good Soldier|
|Main actor:||Peter-Hugo Daly|
Old Serge was a long-serving friend of the Musketeers, who could often be found in the courtyard in Paris. When asked by Aramis about Marsac's duration as a Musketeer, Serge recalled that he was an interesting character. In a rash attempt to stop the Duke of Savoy from discovering that his ex-chancellor, Cluzet, had been captured by Cardinal Richelieu, Serge agreed to act as a prisoner with an appearance matching that of Cluzet's himself.