Arthur C. Clarke appeared in three series in the past:
MYSTERIOUS WORLD (1980)
WORLD OF STRANGE POWERS (1985)
MYSTERIOUS UNIVERSE (1994)
I bought all three in DVD.
STRANGE POWERS is difficult to find, but in AUSTRALIA they have all of them in DVD, so check AU stores.
I somewhat love these 'mysteries' series, and have watched some, from 'unexplained mysteries' to 'extreme mysteries' etc, but Clarke's series are by far the best.
First of all, they don't sensationalize items they are discussing (from fairies to the Mars canals to strange animals to voodoo to prior lives etc ) in the way most more recent series do, to the point you have an hard time parting fiction and SFX from truth.
In these series they only interview eye witnesses and experts and do so concisely (every segment runs about 10 minutes ); the approach is that of skepticism, but without the annoying attitude of Dawkins' broadcasts. Dawkins sounds like a bigot of science going after the bigots of paranormal etc; instead, Clarke's conclusions are mostly skeptical, but without appearing jaded.
Typically, they present a short 'pro' and 'con' segment.