What Is It? A giant snake thing. Or possibly a dragon with a long neck... Sorry. Godzilla.com doesn’t really make it clear.
First Seen In...Atragon (1963)
Origin: He was a dragon (ah!) who lived in the sea and attacked warships which fought him off with electric shocks and he tried to swim away but he was shot by a powerful freezing cannon and aliens came down and took control of Manda and made him attack humans until humans freed him from alien mind control and made him attack them back.
Powers: Crushing with his body, fast swimming, breathing underwater, strategic hissing.
Who Should Do The Voice-Over If It Speaks Or Roars? Brenda Blethyn.