Amphibion

Bursting onto the scene in 1976 courtesy of the legendary Bronze Age creative team of Steve Englehart and George Pérez, Amphibion is a Marvel curiosity with a debut that carries serious collector prestige — The Avengers #148 is no throwaway issue. Though their catalog footprint is small, this character shares pages with heavy hitters like Scarlet Witch, Iron Man, and the Squadron Supreme's own Tom Thumb, placing them squarely in one of Marvel's most ambitious storytelling eras. The fact that Amphibion surfaces across nearly five decades of publishing — from 1976 all the way to 2022 — hints at a staying power that quietly defies those modest appearance numbers. For fans who love digging into the deeper corners of Avengers history, this is exactly the kind of Bronze Age gem worth tracking down.