If watching network television is a habit (and it is), the networks have given folks plenty of chances to end their addiction on Saturday night. With few exceptions, including “48 Hours,” Saturday nights have become a revolving door of repeat dramas. Of all of the networks, Fox was an island of stability, airing the same police reality series for more than two decades running. All of that came to an end last Monday, when the network announced the cancellation of “America’s Most Wanted” after 23 years on the air.

The series has contributed to the capture of 1,151 criminals as it became a mainstay of weekend viewing. Fox will air four “Most Wanted” specials over the course of the 2011-2012 season.

Neither “Cops” nor “Most Wanted” will air tonight, as Fox is airing a Major League Baseball game (6 p.m., Fox). Teams vary by region, so check local listings.

“Cops” will return next year, making it one of the handful of original shows left on Saturdays. In addition to “48 Hours,” CBS will move “Rules of Engagement” to Saturdays and team it up with repeat helpings of other CBS comedies.

• Despite its 23 years, “Most Wanted” is not the longest running Saturday feature. That status belongs to “Saturday Night Live” (10:30 p.m., NBC) that has endured through seasons good, bad and very bad since 1975. This season ends with Justin Timberlake hosting the show for the fourth time. Lady Gaga appears as musical guest.

• As network dominance declined on Saturday, Cable networks filled the void with marathon helpings of their reality fare. Daylong dollops of “The Real World,” “Trading Spaces” and “Project Runway” helped familiarize millions with those series, turning casual viewers into habitual abusers through sheer saturation programming.

This weekend Hallmark offers a variation on the cable marathon, not with a reality show, but with a staple of family viewing from a generation ago. Catch 24 hours of “Little House on the Prairie” (5 a.m. Saturday to 5 a.m. Sunday). This series’ uplifting tales about responsibility, respect, family and community gained it fans the world over. It also featured a who’s who of actors during its run between 1974 and 1983. During the first season, director Leo Penn helmed one episode and cast his young son, giving Sean Penn his very first screen role.

Tonight’s other highlights

• Tobey Maguire, Kirsten Dunst and James Franco star in the 2007 comic book sequel “Spider-Man 3” (7 p.m., ABC).

• “Special When Lit” (7 p.m., Documentary Channel) celebrates the bygone popularity of pinball machines.

• Doppelgangers on the loose bring double trouble on “Doctor Who” (8 p.m., BBC America).

• Manu Bennett stars in the 2011 mythical fantasy “Sinbad and the Minotaur” (8 p.m., Syfy, TV-14).

• Scheduled on “48 Hours Mystery” (9 p.m., CBS): an alleged real estate swindler winds up in a morgue.

• Bill Bailey and Jennifer Hudson appear on “Graham Norton Show” (9 p.m., BBC America).