William Oliver Campbell is an American film and television actor. He first gained recognition for his recurring role as Luke Fuller in the TV series Dynasty. Then he became known for playing Rick Sammler on Once and Again, Det. Joey Indelli on Crime Story, Jordan Collier on The 4400, and Dr. Jon Fielding on the Tales of the City miniseries. His most notable films include The Rocketeer, Bram Stoker's Dracula and Enough. He portrayed Darren Richmond on the AMC television series The Killing, Dr. Alan Farragut in the SYFY series Helix and Det. John Cardinal on CTV's Cardinal.

Once and Again is an American family drama television series that aired on ABC from September 21, 1999, to April 15, 2002. It depicts the family of a single mother and her romance with a single father. It was created by Marshall Herskovitz and Edward Zwick.