Available via a coupon mail-in offer in Wizard: The Comics Magazine #70.
A partial reprint of the original #1, including:
"The Human Torch"
Professor Phineas Horton creates a synthetic man, or android, but inexplicably, it bursts into flames in the presence of oxygen. Initially inspiring fear in the public, they demand it be destroyed until the Torch shows his capacity for good.
"The Sub-Mariner"
Prince Namor, a half-breed born of a surface-dwelling father, Commander Leonard McKenzie, and royal Atlantean Princess Fen, is raised below the sea in ignorance of the world above until men blunder into his realm. Atlanteans have planned a War of Revenge against the surface world, and now Namor's curiosity is aroused about the World of Man.
"Adventures of Ka-Zar The Great"
Young David Rand arrives in the Belgian Congo with his father John, owner of a diamond field, and his mother Constance. Stranded by a plane crash, jungle fever soon claims Constance. David is raised in the ways of the jungle by his father until evil men come for the diamonds, leaving John Rand dead. Ka-Zar goes to live with his friend Zar the lion, and becomes Zar's brother, or Ka-Zar.