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For other characters named Mark, see Mark.
Mark came to the clinic because he was suffering from headaches and aches all over his body. His daughter Ali came with him because they were going shopping for her prom. However, when Gregory House saw them, they were arguing about things and it was interfering with his examination. As a result, he started mimicking Mark to answer Ali's objections so that Mark could keep quiet. Dr. House noticed that Mark's voice was very nasal and when he pressed his fingers against his forehead above the eyes, Mark winced with pain. Dr. House soon diagnosed him with a common cold and sent him on his way. However, Ali found him entertaining and was soon calling him all the time. Dr. House ignored her so she came to the hospital. When she confronted him, he said he was going to call her in a few years. She said she only wanted to thank him for seeing her father, then told House he only had to wait six months to call.