The originalheld the mantle from 1962
Henry Jonathan "Hank" Pym
Powers. No innate powers; genius biochemist/inventor. Discovered "Pym Particles" enabling size-changing (shrinking to insect size as Ant-Man, growing to giant size as Giant-Man/Goliath); cybernetic helmet to communicate with/control ants and insects; later identities Yellowjacket (bio-stingers, flight) and the Wasp.
Origin
Brilliant biochemist Hank Pym discovered the subatomic 'Pym Particles,' which he harnessed to shrink or grow at will. After adventuring as Ant-Man and Giant-Man, he adopted the Goliath identity to battle threats as a towering founding member of the Avengers.