Yu-Gi-Oh! 5D's episode 35: "Dark Signs, Part 4"
Dr. Schmidt, or pronounced in the Japanese Version as Dr. Schmitt, is the one who tended Yusei Fudo.
Yusei Fudo is left severely injured after his Shadow Turbo Duel against Kalin Kessler, as a shard is impaled in his stomach. Crow takes Yusei to Martha's refuge so that he can receive the required surgery. Here, Dr. Schmidt begins operating on him, assisted by Martha.
He manages to save Yusei's life by removing the shard, along with its pieces from his body. Afterwards, he and Martha emerge from the operating room and tell everyone that Yusei is going to be okay once his wounds have sealed up, since the shard hadn't damaged any of his internal organs or blood vessels.
After Yusei's fierce Shadow Duel against Roman, which ended with Martha getting sacrificed in order to save Takya. The Signers and their companions are back in Martha's home, as Takya, Jun and Michan try to apologize to the Doctor. As Takya admits that it was his fault that she ended up like that, Trudge also takes the blame stating that he should have grabbed her on that particular moment. As everyone thinks that she's dead including the doctor, Yusei leads them to believe that in order to get her back along with everyone else, they just have to defeat the Dark Signers. As everything thats been going on Satellite is because of their actions.
After that Dr. Schmidt and the children are left on the house to rest.
Pre World Racing Grand Prix
Martha and Schmidt try to convince a withdrawn old man, Bashford, to move into Martha's place, due to the dangereous nature of his house. After failing to do so, the children in Martha's care convince Crow to do it for them.
Warning: Default sort key "Schmitt, Dr." overrides earlier default sort key "Schmidt, Dr.".