Doctor Seizer was a Navy doctor.

Seizer treated the French sailors from the Piper Maru who had extreme radiation burns, however, without any information of what happened from the sailors or the French government, he was at a loss. He was surprised to find one man, Bernard Gauthier, unaffected, so he let him go after a day.

Agents Fox Mulder and Dana Scully came to get information on the sailors, but the radiation and Gauthier's name was all he could give them. (TXF: "Piper Maru")

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