Martha Nilsen

Martha Nilsen made her comics debut in the pages of Dennis back in 1959, stepping into the Silver Age alongside the mischievous young star of the series and the loyal Ruff. Published by Kåre Lundgren and appearing across seven decades' worth of Dennis stories, she racked up an impressive 72 catalog appearances — a testament to just how essential she became to the world of the strip. One of those appearances even carries key-issue status, making her a genuine find for collectors who dig deep into this beloved Scandinavian run.