Great Barrier - Production

Production

NBC renewed Law & Order: Criminal Intent for a fourth season on May 12, 2004. On Sundays during the 2003-2004 broadcast network TV season, Law & Order: CI was undefeated in its third season against regular competition in 18–49 and was the only NBC regular series to win that time slot in the last eight years.

In a broadcast network first, Law & Order: Criminal Intent viewers chose the fate of Detective Robert Goren's nemesis, Nicole Wallace (Olivia d'Abo): whether she lives or dies at the end of the episode "Great Barrier" (aired originally on October 17, 2004). Two versions of the episode were shot before the voting began on October 6 and ended October 20, 2004. The East Coast viewers saw Wallace live; the West Coast viewers saw her die. More than 116,000 viewers cast a vote online. "We are very gratified by the response," said show runner-executive producer René Balcer, "We've always seen this as a gift to our fans, to thank them for their continuing dedication to the series. Live or die, we'll abide by their decision." The choice of Wallace living became the outcome, but Wallace is believed to be killed in the seventh season by Detective Goren's mentor, Dr. Declan Gage (John Glover).

Previous original Law & Order actor Chris Noth guest-stars in the episode "Stress Position" as his character Detective Mike Logan before returning to join the cast for the fifth season.