Alan James "A.J." Quartermaine, Jr. was a fictional character on the ABC soap opera General Hospital. He was the son of the late, Dr. Alan Quartermaine and his wife, Dr. Monica Quartermaine. After being SORASed, the character was played by Sean Kanan from 1993 until 1997. Billy Warlock then took over the role from 1997 until 2003, and reprised it in 2005.