[5] His first known work at Charlton, where he would spend the bulk of his career into the 1960s, was the four-page humor story "The Ride of Paul Revere!
", penciled and inked by Mastroserio and Dick Ayers as, respectively, "Rock" and "Rye", in the Mad-like satiric comic Eh!
[5] 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.
[5] Other work in Charlton's occasional superhero titles including co-creating Mercury Man, with an unknown writer; the character appeared only twice, in Space Adventures #44-45 (Feb. 1962), with Mastroserio drawing only the debut.
[5] In the late 1960s Mastroserio drew stories for Warren Publishing's black-and-white horror magazines Creepy and Eerie, often working with writer Archie Goodwin.
[2] His final published comics work was the full cover art and nine inked story pages, over penciler Mo Marcus, of Charlton's Ghost Manor #3 (Nov.