All is fair in the Dick Wolf TV universe, including character crossovers and actors popping up on more than one series at a time. After getting his start as a writer on Hill Street Blues in 1985, Wolf rose to superstardom when he created Law & Order in 1990. He has since helmed multiple Law & Order spinoffs, including Law & Order: Special Victims Unit, which premiered in 1999. Wolf transported viewers from New York City to Chicago in 2012 with the creation of Chicago Fire. Its spinoffs include Chicago P.D., Chicago Med and Chicago Justice. Wolf later masterminded the FBI universe, made up of FBI, FBI: Most Wanted and FBI: International before launching the CIA spinoff in 2026. See which actors have crossed over from one franchise to another - and which stars have played more than one role for Wolf - below (not including the full-show crossovers within the One Chicago and FBI universes):