Mastroserio's work for Charlton included such Western series as "Billy the Kid", "Black Fury", "Rocky Lane's Black Jack", and "Texas Rangers in Action"; crime fiction such as "Public Defender in Action", "Racket Squad in Action", and "Rookie Cop"; science fiction/fantasy titles such as "Mysteries of Unexplored Worlds", "Outer Space", and "Strange Suspense Stories"; jungle title such as "Nyoka the Jungle Girl", and "Ramar of the Jungle"; the historical-adventure titles "Long John Silver & the Pirates" and "Robin Hood and his Merry Men"; war comics including "Army War Heroes", "Fightin' Army", and "The Fightin' 5"; and such supernatural anthologies as "Ghostly Tales", "Unusual Tales", and "The Many Ghosts of Doctor Graves".