Kojak) as well as first-run series such as the British imports Return of the Saint and The New Avengers. The CBS Late Movie strand was later restructured as CBS Late Night in September 1985 (later revived in October 1989 following the cancellation of The Pat Sajak Show, which had replaced the block eight months earlier), featuring reruns of CBS series, imported and first-run programs; the block was supplanted in March 1991 by Crimetime After Primetime, a rotating collection of original crime drama series (including several Canadian-originated productions) that lasted until the Late Show with David Letterman premiered in 1993. Networks have also run music programs in the time period, including NBC's The Midnight Special (which featured contemporary music performances conducted on a soundstage) and Friday Night Videos (which originally was formatted as a music video showcase, before evolving in 1991 into a variety program featuring live music performances, celebrity interviews, stand-up comedy performances, movie reviews, viewer polls and comedy sketches, and finally to an exclusive stand-up comedy showcase format in 2000), and ABC's In Concert (which featured pre-recorded concert performances from various established and up-and-coming music acts). News ABC's Nightline has long been an exception to the networks' "comedy/variety" formula. Debuting in 1980 (although it traces its roots to a series of half-hour special reports on the Iran hostage crisis that began in 1979), Nightline is a nightly half-hour newsmagazine that originally aired immediately after local newscasts on ABC's owned-and-operated stations and affiliates, before being pushed to a later slot in January 2013, when it switched timeslots with Jimmy Kimmel Live. The three major networks have also ventured into overnight newscasts that air after the traditional late night schedules (airing as cycling hour-long blocks that air as early as 2:00 a.m. Eastern Time by default, although stations typically preempt portions of these programs to air locally produced and acquired programming after the network late night lineups). NBC premiered the first overnight network news effort in July 1982 with NBC News Overnight, an hour-long program that mixed hard news features with incisive topical commentary and light-hearted feature stories; it aired for 18 months until high production costs and limited ad revenue led to the show's discontinuance in December 1983. CBS followed in October 1982 with CBS News Nightwatch, which maintained a hybrid traditional newscast and interview/debate format (and, for its first two years, allowed affiliates to include local news updates during