TV's Best Bets

■ MELISSA MCCARTHY MOVIE MARATHON

FX, beginning at 3 p.m.

Melissa Mccarthy gets the spotlight on FX Saturday as the network airs three of her movies — “Spy” (2015), “The Heat” (2013) and “Ghostbusters” (2016) — back-to-back.

■ “PLANET EARTH: SOUTH PACIFIC” MARATHON

BBC America, beginning at 4 p.m. BBC America presents a marathon of all six episodes of 2009’s Planet Earth: South Pacific nature documentary series. Benedict Cumberbatch narrates.

■ MAJOR LEAGUE BASEBALL

FS1, beginning at 4 p.m. Live

The Baltimore Orioles visit the Cleveland Indians in the first game of FS1’S MLB doubleheader. In the second game, the Milwaukee Brewers visit the St. Louis Cardinals at Busch Stadium.

■ COLD JUSTICE

Oxygen, 6 p.m.

Back in Texas in the 1990s and 2000s, Kelly Siegler was a tough prosecutor who won convictions in 19 out of 20 death penalty cases. Today, the former ADA is in her fifth season as lead investigator on “Cold Justice,” a show that tries to wrap up some of the nation’s estimated 200,000 unsolved homicides. So far, she says, she’s worked on “65-plus cases with 37 arrests and 18 convictions, sometimes with no DNA or living eyewitnesses.”

■ MONSTER ENERGY NASCAR CUP SERIES: BASS PRO SHOPS NRA NIGHT RACE

NBCSN, 7:30 p.m. Live

The steeply banked, 0.533-mile short track at Bristol Motor Speedway in Tennessee provides a 500-lap endurance test for Kyle Busch, Kevin Harvick, Joey Logano, Brad Keselowski, Martin Truex Jr., Clint Bowyer and other top Cup Series drivers.

■ PEARL IN PARADISE

Hallmark Channel, 9 p.m.

Original Film! Magazine photographer Alex Anderson (Jill Wagner) and author Colin Page (Kristoffer Polaha) head to Fiji in search of the elusive blue pearl that Colin wrote about in his bestselling novel, “Pearl in Paradise.” While searching for the precious pearl, the two discover that finding love could be the rarest adventure of all.

■ MURDER MADE ME FAMOUS

REELZ Channel, 9 p.m.

New Episodes! This series continues to explore why certain killers attract the attention of millions and their stories generate so much interest. New hourlong episodes include looks at Jack the Ripper, ruthless serial killer Jeffrey Dahmer and others.

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Larry Horricks / Twentieth Century Fox Melissa Mccarthy and co-star Jason Statham pose as a “happy” couple in “Spy,” one of the movies being shown as part of the Melissa Mccarthy Movie Marathon on FX.