Charlton Comics was never one of the heavy hitters of the comics industry, but the company had a long and respectable run as a publisher from the end of World War II until the early 1980s. They had a reputation as a “minor league” comics company, as a lot of people who became well regarded artists for Marvel and DC started out doing work for Charlton: Steve Ditko, Sal Trapani, John Byrne, Roger Stern, Denny O’Neil, Jim Aparo, Sam Grainger, Bob Layton, and Mike Zeck, among many others.
In response to both DC and Marvel reviving the superhero comic book in the late 1950s and early 1960s, Charlton created their own superhero line, including Captain Atom, Blue Beetle, the Question, the Peacemaker, Nightshade, and Peter Cannon, Thunderbolt. That line eventually petered out, and Charlton did mostly licensed comics in the 1970s.
This all relates to Watchmen, trust me.