Best Bets on TV tonight

Yes, it's a holiday weekend, so there must be a marathon somewhere. The five original "Planet of the Apes" movies (9 a.m., Sci-Fi Channel) will be shown in order, followed by "Primal Force" and "Monkey Shines."
Patty Duke gets into the habit of solving crimes in this made-for-TV movie, "Murder without Conviction" (8 p.m. Hallmark Channel). She plays a nun who's looking into a 30-year-old murder. Megan Ward co-stars.
Roma Downey and Tim Matheson star in this 2001 TV movie, "Second Honeymoon" (9 p.m., CBS) as a couple on the verge of divorce after 20 years. Could it be that a surprise anniversary gift of a "second honeymoon" will lead them to change their minds?
"Mystery!: Inspector Lynley" (9 p.m., PBS) begins a new series of four stories begins with "Playing for the Ashes." Lynley and Havers (Nathaniel Parker and Sharon Small) pursue a string of murders "in the highest echelons of English society" while trying to find time for their separate romantic interests.
The acclaimed drama, "Six Feet Under" (9 p.m., HBO) is wrapping up the season with dangling plots: David took a chunk off a guy's ear during an altercation. Is he biting off more than he can chew during the season finale?
VH1 travels across the country looking for the next Keith, Laurie, Danny and Shirley Partridge in this seven-episode reality series, "In Search of the Partridge Family" (9 p.m., VH1). From a field of 32 people, viewers will vote for four winners, who will be cast in a pilot for the updated version of the '70s sitcom later this fall.