|Seen|| "Bad Teeth"|
|Mentioned||"Season of the Hexenbiest"|
|Service of||Royal Family in Vienna (bounty hunter)|
Marnassier arrived in Portland, Oregon in a shipping container loaded in Le Havre, France on a ship owned by G.Q.R. Industries of Rotterdam, Netherlands. He killed at least two men in the container with him and at least two others after arriving in Portland, including Yates, a security guard and stole the keys to a pickup truck from him. Later, he escaped from the pier as Nick Burkhardt arrived, using the stolen pickup truck. Afterward, he speaks with Eric Renard on the phone.
He lured two FBI agents to a lumber company. He killed Special Agent Durwell and used Special Agent Kanigher to set a trap for Nick. By the time Nick arrived, Special Agent Kanigher was also dead. Marnassier laid next to her body to make it look like he was dead, and when Nick had his back turned, Marnassier stood up, morphed into his Mauvais Dentes form, and lunged at Nick.
Marnassier attacks Nick and fights with him for a couple minutes before running off in the warehouse. He hides and eventually jumps down from above Nick and attacks him again. He continues fighting with Nick until Kelly Burkhardt comes to help Nick fight him. Kelly grabs Marnassier and when he hits Kelly to get away, she puts a knife in his neck, which kills him.