Dr. Mattie Harcourt

A product of Peter David and Gary Frank's celebrated mid-'90s Supergirl run, Dr. Mattie Harcourt stepped onto the DC stage in 1996, bringing a grounded, human presence to one of that era's most inventive takes on the Girl of Steel. With only a handful of appearances spread across Supergirl and Supergirl Annual, she's a supporting player rather than a headliner, but she keeps genuinely remarkable company — sharing pages with Supergirl herself, Fred and Sylvia Danvers, and even the fearsome Gorilla Grodd. For collectors who love the texture and depth that strong supporting casts give a series, Dr. Harcourt is a quiet gem of the Modern Age worth seeking out.