The 3 3/4 " line was extremely well made, utilising figure knowledge gleaned from Takara and Mego Micronauts. Mego made the Black Hole figures above industry standard with amazing articulation.

Dr Kate, Dr. Durant, Charlie Pizer, Dan Holland, and Harry Booth.
Sentry, Maximillion, and Reinhardt; the baddies.
The Big 3: Old B.O.B, S.T.A.R and the Humanoid
The "Big Three" were blown away in Canadian Sears and K-Mart outlets for $1.00, probably the three best figures in the series. It's a shame Mego released them last.
Carded Humans courtesy of Michael Farence.

Carded Robots courtesy of Michael Farence.


Old B.O.B, STAR and Captain Holland are on Canadian Grand Toys cards and are quite difficult to find. B.O.B and STAR were only available in Canada and Italy. Photos courtesy of Craig MacKillop.
In Italy, Gig repackaged the Mego Buck Rogers Laser Scope and gave you a free Captain Holland.
Unproduced Black Hole Cygnus playset utilized the Vacuform style playset that Mego was doing in the late 70's much like the Mego Buck Rogers Space Port and Mego Pocket Heroes Batcave. The Cygnus was also pitched as a vinyl playcase.
As a fan of the Black Hole, it often bothers me this was never made. I think 10 year old Brian would have loved it to death.
The prototype for this piece apparently showed up in Italy.