Billy Warlock is an American actor known for playing Eddie Kramer, a lifeguard on the first two seasons of Baywatch and in the reunion movie in 2003, as well as for numerous daytime roles, most notably Frankie Brady on Days of Our Lives and A.J. Quartermaine on General Hospital.

A.J. Quartermaine is a fictional character from General Hospital, an American soap opera on the ABC network. Born on-screen in 1979 as the only biological child of the iconic Drs. Alan and Monica Quartermaine, A.J. was "SORASed" in 1991, revising his birth year to 1973. The role has been most notably portrayed by the actors Sean Kanan from 1993 to 1997 and Billy Warlock from 1997 to 2003, with a brief return in 2005. Kanan made his on-screen return as A.J. on October 26, 2012, after a 15-year absence. Kanan announced in March 2014 that he would once again be leaving the series, voicing his disappointment over the writing for the character.