Festus? Shucks, he was alright, but not as good as Chester (played by Dennis Weaver), who he replaced. I can still hear "Mr. Dillon, Mr. Dillon!" There were a lot of other great ones, Barney Fife certainly ranks at the top, Tonto was outstanding, Jimmy was a good sidekick for Superman, Penny for Sky King, Pat Buttram for Roy Rogers, "Frog" for Gene Autry, Pancho for the Cisco Kid (Oh Pancho, Oh Cisco), Dr. Alexi Zarkhov for Flash Gordon (although calling him a siedekick may be stretching it a bit). In a way, I suppose, Clint Eastwood got his start as a sidekick of sorts as Rowdy Yates, sidekick to Gil Favor, the trail boss in Rawhide. Of course, the penultimate "sidekick" award MUST go to Gabby Hayes, who practically defined the genre!