"The Box" is the second episode of the third season of the American science fiction drama television series Fringe. The episode was co-written by Josh Singer and Graham Roland, and directed by Jeffrey Hunt. The third season spent its time alternating between the prime and parallel universes, and "The Box" was set in the former. It followed a mysterious box that when opened, killed whoever heard it. The fringe team of Fauxlivia, Peter, and Walter investigate, with unknown consequences to the creation of a doomsday device.

The third season of the American science fiction television series Fringe began airing on the Fox network on September 23, 2010, and concluded on May 6, 2011. Twenty-two episodes long, the season was produced by Bad Robot Productions in association with Warner Bros. Television, and its showrunners were Jeff Pinkner and J.H. Wyman. Lead actors Anna Torv, John Noble, and Joshua Jackson reprised their roles as FBI agent Olivia Dunham and the father-son duo Walter and Peter Bishop. Previous series regulars Lance Reddick, Jasika Nicole, and Blair Brown also returned, along with recurring guest stars Kirk Acevedo, Seth Gabel, and Ryan McDonald.