The series opens showing how various Golden Age heroes have adjusted to life after World War II. The members of the Justice Society of America and All-Star Squadron have retired. Tex Thompson, formerly the Americommando, has returned from Europe a war hero, and has used his fame to start a political career, resulting in him being elected a Senator. He then recruits several former heroes to create a new group of heroes for the 1950s. The group includes Robotman, who is losing his sense of human ethics, the Atom and Johnny Thunder, who are both looking for somewhere to belong, and Dan the Dyna-Mite (Daniel Dunbar), who is lost after the death of his mentor TNT. Thompson oversees various experiments on Dunbar which change him into the incredibly powerful Dynaman.