"Jacksonville" is the 14th episode of the second season of the American science fiction drama television series Fringe, and the 35th episode overall. In the episode, Olivia is forced to recount her time spent as a child in tests conducted by Walter to regain the ability to see objects that have been influenced by the parallel universe and prevent the deaths of innocents. Though successful, Olivia comes to learn the truth about Peter, that he is from the parallel universe.

The second season of the American science fiction television series Fringe commenced airing on the Fox network on September 17, 2009, and concluded on May 20, 2010. The season was produced by Bad Robot in association with Warner Bros. Television, and its showrunners were Jeff Pinkner and J. H. Wyman. Actors Anna Torv, John Noble, and Joshua Jackson reprised their roles as FBI agent Olivia Dunham and father-son duo Walter and Peter Bishop, respectively. Previous series regulars Lance Reddick, Jasika Nicole, Blair Brown, and Kirk Acevedo also returned, though with Acevedo in a limited capacity.