scripts in April 2007. Renewal for a fourth season of Medium was announced on May 7, 2007, with an undetermined premiere date and number of episodes. It was the seventh series to be renewed by the network, behind solid performers Heroes and Law & Order: Special Victims Unit. One week later, the network announced that Medium would move to the Sunday 9 p.m. time slot upon its return in January 2008. News on the series' return did not come until December 2007 when NBC announced that the fourth season would begin in January in its original Monday 10 p.m. time slot, despite the WGA Strike of 2007, which forced the show to cease production, allowing for only nine segments/episodes to be filmed. Scheduling returning mid-season shows in timeslots where they were previously successful was a pattern for NBC during the strike: Law & Order returned to Wednesdays at 10 and The Apprentice was back on Thursdays at 9:00 p.m. With the ratings improvement Medium demonstrated in its fourth season after returning to Mondays, it was one of the first series to be renewed in an early announcement in April 2008 from NBC regarding its 2008–09 season. Similar to the previous season, Medium was initially scheduled to move to the Sunday night line-up; however, a December 2008 press release revealed that the fifth season would air in the series' original Monday night 10 p.m. time slot. After some ratings erosion during its fifth season, NBC renewed Medium for an abridged sixth season in early May 2009. However, within a week negotiations stalled over episode count and subsequently NBC decided not to renew the series despite the fact that it outperformed some of the network's renewed shows. Within 24 hours of NBC's cancellation, CBS, whose production arm produces the series, renewed the show for a full, 22-episode, sixth season, placing it in the Friday at 9:00 p.m. slot between fellow CBS in-house productions Ghost Whisperer (which had a similar theme to Medium) and Numb3rs. CBS first aired this series with a rerun episode on July 21, 2009. The sixth season premiered on Friday, September 25, 2009 at 9pm. Throughout its sixth season, Medium and its lead-in Ghost Whisperer won their respective time slots on most Fridays, and each show took turns being the most-watched show of the night. As the season drew to a close, Ghost Whisperer was considered a definite renewal,