In the 60's and 70's, TV producers were looking for new things to add to the Saturday morning kidvid schedule. Cartoons were the bill of fare, but they were slow and expensive to produce. There were many attempts at live-action series for kids, most were low budget versions of their adventure/comedy brothers in prime time.
One especially weird series (and mind you, there were a LOT of weird shows) was "Lancelot Link: Secret Chimp". More than just another sendup of the popular spy film genre - this live-action series featured actual chimps playing all the parts. Two chimps played all of the parts by donning different costumes. The voices were a variety of comic celebrity impressions (could Malachi Throne be far behind?) that sort of synchronized to the chimps chewing at the air.
Though forgotten today, the series was the most expensive children's show at the time. A pair of writers from the popular TV spy spoof "Get Smart" penned scripts. There were extensive chimp-sized sets, lots of location work... "Link" was a very ambitious project considering how many Saturday morning live-action series were made cheaply as money-savers over cartoons. Also in strict accordance with Saturday morning cartoon law of the time, the chimps were in a band that released an actual record (and no, they weren't The Monkees, smart guy...).
I first saw the show in the 80's on a Chicago TV station's weekday morning cartoon block. I knew that it was old, but it was so odd that the vintage didn't really matter. It was brave television like this that paved the way for other primate-based media ventures like "Every Which Way But Loose", and anything starring Joe Don Baker.