Based on the then popular giant robot anime ( animation originating in Japan)
they came in three sizes 24", 5", and 3.5 "
Another popular robot Voltron
The Original TV series came out in 1983
These were really great robots but were just the for runners to the ever popular Transformers, Gobots also came out in 1984 they transformed from robots to vehicle.
MORE THAN MEETS THE EYE