The Herculoids is one of the classic hero cartoons that Hanna-Barbera produced the mid-late 60s. It was a unique mixture of futuristic and prehistoric. The characters looked like something out of "100,000 B.C.," but they had space ships and powers and weapons that you'd find only in the sci fi world.
The cartoon was perfectly geared to little boys and girls who dreamed of adventure, taking them to a different world with interesting creatures, powerful friends, and evil villains. The positive message that can be drawn from the show pertained to the value of teamwork -- The Herculoids had to work together as a team -- helping each other out of jams, protecting each other, combining their powers, etc. -- to defeat the villains. However, this was not a "message" cartoon per se. It was intended primarily for entertainment.
The quality of the animation was poor by today's standards, but far better than what followed in the 70s and 80s, when the animators' budgets began to be slashed.