Privateer Press, the creators/publishers of the kaiju collectible miniatures game Monsterpocalypse, recently released a Voltron: Defender of the Universe non-collectible miniatures game. The figures are completely compatible with the Monsterpocalypse figures and rules, so you could have Voltron take on those monsters and boosters.
The Voltron game comes with 22 pre-painted miniatures, including the Voltron figure below as well as 5 Voltron Lion figures, and is about $32-$35 depending on where you buy it.
http://privateerpress.com/voltron