big zam
A fictional walker mecha from the Gundam franchise. It first appeared in the Mobile Suit Gundam TV series from 1979.
The Big Zam is a Principality of Zeon heavy walker designed as a prototype anti-warship and anti-fortress mobile armor.
It is huge and is armed with a very powerful large mega-particle beam cannon.
If it had been mass-produced, it would have spelled doom for the Earth Federation Space Force.