Besides editing over thirty titles in ten years, Masulli co-created the Charlton characters Sarge Steel and the Son of Vulcan.
[4] Although he soon became Charlton editor Al Fago's assistant, during this period Masulli occasionally contributed artwork to the publisher's titles, including covers and even penciling an entire issue of Atomic Rabbit.
[5] "[I did e]verything from proofreading to art corrections, lettering titles for [editor] Ernie Hart's books, traffic managing, liaison with the Comics Code, and anything else, including cleaning the storeroom.
"[5] Some of the more notable titles Masulli edited included Atomic Mouse, Billy the Kid, Out of This World, Strange Suspense Stories, This Magazine Is Haunted, and Thunderbolt.
Not only was he in charge of all of Charlton's magazines, including its profitable music division, but he was acting as both art director and managing editor for the comics line.