The Sea Devils were a team of adventurers who specialized in underwater missions. They were Dane Dorrance, the leader; his blonde girlfriend Judy Walton; her younger brother Nicky; and muscle-bound friend Biff Bailey. (This is basically the same configuration as the Fantastic Four, who first appeared at around the same time.) The team found themselves in dangerous adventures against various underwater menaces, many of them giants of one sort or another.
On occasion the Sea Devils would team up with a group called the International Sea Devils, which was naturally composed of agents from various exotic locales. Other allies included Man-Fish, a green-skinned being from Atlantis, and a group of amateur divers called the Tadpoles.
The Sea Devils were part of a small genre that is often thought of now as 'Underwater Adventure'; this included such television shows as Sea Hunt and Voyage to the Bottom of the Sea.
Sea Devils was created by writer Robert Kanigher and artist Russ Heath, who are otherwise known for their DC war comics.