Mercier was a member of a gang called Sudden-Death Overtime, obsessed with an ancient ice sport that Goalie Ledoux's ancestors played. Winger Mercier was sent to procure a secret formula for a new type of Nuka-Cola while Ledoux made contact with the buyer. Mercier's been gone an awfully long time...
Mercier (as well as Goalie Ledoux's last name) are typically francophone sounding last names. In the case of Mercier, Messier. Canadian origin names are common when making fictional hockey players, due to the popularity of the sport in Canada.