There were actually three different Voltron shows and sets of toys.
Voltron III was the 5 lions Voltron.
Voltron II was the three humanoid style robots that formed the "Gladiator Voltron".
Voltron I was the 15 vehicle(Air, Sea, and Land groups) Voltron.
I still have my toys from I and III, but while I remember hearing about and seeing toys for II in the stores, never actually played with any of them as a kid. I never bought one, nor did any of my friends.
Since most of us are Voltron fans here, in one form or another....Did you all ever feel like Mighty Morphin Power Rangers was just a blatant, live action ripoff of Voltron? I never watched it for many reasons, but that was the biggest for me.