Quoc: While mentioned in passing throughout later seasons, Burke officially returns in the tenth season in order to conclude Cristina Yang's departure from the series.

Answer this question based on the passage: what season does burke come back in grey's anatomy?
HW Chung: OK, some thoughts:
The relevant information is: While mentioned in passing throughout later seasons, Burke officially returns in the tenth season in order to conclude Cristina Yang's departure from the series. The answer is the tenth season.