In 1953, Martin Goodman the publisher of Interstate Publishing Group (sometimes known as Marvel, and generally referred to as Atlas these days, after the distributor whose mark appears on the cover) noted the success of the Adventures of Superman TV show and figured there might again be a market for superheroes.
Goodman publishing's Timely Comics' flagship heroes--Captain America, Sub-Mariner, and Human Torch--had been popular in the War years, but were all gone by 1950. In
Young Men #24 (1953), they can roaring back.
"The Return of the Human Torch" with art by Russ Heath picks up following the events of his last adventure in 1949. The Human Torch, after a 4 year absence, busts up on the hideout of the crime boss that sprayed him with a Soviet chemical that dosed his fire, and buried him in the desert. Luck for the the Torch, this desert part of the desert would be the site of a atomic test. Resurrected by the bomb, he was more powerful than ever.
He goes looking for Toro who disappeared in Korea. Flying right over, he finds Toro has been brainwashed and is fighting for the commies! Torch defeats him and brings him home to turn him over to doctors to fix him:
The team is back together!
In "Back from the Dead" with art by John Romita, we find the Red Skull has given up his allegiance to Hitler's regime, and is now the head of an international crime syndicate with ties to (you guessed it) "the Reds." Meanwhile, at the Lee School, Professor Steve Rogers tells his student the history of Captain America, but most of the kids think he's just a myth. Bucky (who seems weirdly to have not aged, assuming its the same kid) gets in a fight with the Cap-deniers. Bucky wants Cap back, but Rogers isn't convinced. Then, they hear on the radio that the Red Skull has returned and taken the UN hostage!
Captain America and Bucky are reborn! And the Red Skull is soon defeated...for now.
Bill Everett brings us "Sub-Mariner." Cargo ships keep sinking myteriously near the same small island. An investigation determines the wrecks have been stripped to the bulkhead. Police woman Betty Dean realizes she knows Sub-Mariner and calls up Admiral Saybrook to see if he can get in touch with Namor at the South Pole.
Four days later, Namor shows up at Betty's apartment in a suit. He agrees to look into the strange piracy. He discovers the ships are being sank and looted by robots. Robots he later learns are from Venus. The though Earthmen were weak, but they didn't reckon on Sub-Mariner. He roughs them and saves the day.
And just like that, the greatest Timely heroes are back in action!