Robert Chase is the Australian doctor on House's original diagnostic team in House M.D.
Jesse Spencer portrays Chase, who joins Gregory House's early team at Princeton-Plainsboro. The character is an intensive-care specialist and later develops a broader role within the hospital. His Australian background is part of the character's established identity and distinguishes him from the other original fellows.
Chase's work on the team places him alongside Eric Foreman and Allison Cameron. Their different medical backgrounds and personalities create disagreement over House's methods, patient privacy, and the risks of experimental treatment.
Robert Chase is sometimes confused with Jesse Spencer's later television role in Chicago Fire. The two are separate characters in different series. In House M.D., Chase remains closely tied to the diagnostic department and the hospital's evolving staff structure.