You could argue that any Western is only as good as its villains: Think Lee Van Cleef in The Good, the Bad and the Ugly or career-heavy Vic Morrow in Posse From Hell. Well, this Saturday morning starting at 6AM/5c, you can watch Cleef, Morrow and a whole lineup of actors with serious Western pedigree -- Warren Oates (The Wild Bunch), R.G. Armstrong (El Dorado), and Claude Akins (Rio Bravo) -- don the proverbial black hat as AMC airs a marathon of The Rifleman episodes showcasing the best villains of the series. Other guest stars include Michael Landon, Dennis Hopper and Martin Landau, an actor who went on to win the Oscar for his decidedly not evil role in Ed Wood.

Click here for the full schedule of The Rifleman on AMC.