/lit/ - Literature

Captain Cosmos sounds like Captain Future, one of the also-rans of the 'hero pulp' magazines (magazines that didn't feature a variety of stories by a variety of authors but a single story about a reocurring character by the same author. The Shadow began this and was the most popular followed by Doc Savage, Captain Future is basically Doc in a science fiction setting of the far distant future of 1997)

But the stories and writer will probably be a portmanteau of various authors and stories and tropes from the era