"Mandrake the Magician" was a very popular comic strip back in the day. Because of this, it's not surprising that someone would try to make a TV show out of it, though the networks were not impressed and never okayed the show. Because of that, there's just this pilot episode...which is available to watch on YouTube.
Mandrake is apparently a genius at hypnosis and mind control. He solves crimes and rights wrongs and is aided by Princess Narda and Lothar (Woody Strode). However, an evil doer kidnaps Narda in order to force Mandrake to help him cross-examine a man...and Mandrake isn't about to betray the cause of niceness in order to rescue Narda. So what's next?
With characters like Mandrake and the like, you would expect a lot of action and suspense. Sadly, you have neither in the show and instead it's incredibly static and dull...which is most likely why the adventure series was never adopted by the networks. Only okay...nothing special.
By the way, Woody Strode was a fine actor...with great performances in "Spartacus" and "Sergeant Rutledge". He also, along with Kenny Washington, was also the first to cross the color barrier in pro sports--signing with the LA Rams BEFORE Jackie Robinson signed with the Dodgers. Yet, sadly, none of his brilliance is evident in the show...and he's given very little to do.