Undertow

Surfacing from the Marvel Universe's Copper Age tide, Undertow made a splash in The New Mutants Annual #5 (1989), courtesy of the creative team of Louise Simonson and Rob Liefeld. With only three catalog appearances spread across marquee annuals — Avengers West Coast, Fantastic Four, and The New Mutants — this character cuts a rare, collectible figure, sharing those pages with heavy hitters like Captain America, the Human Torch, and aquatic company including Sharkskin and Eel. Brief in tenure but rich in context, Undertow is a genuine curio of the annual-event era, the kind of deep-cut discovery that reminds collectors why flipping through those oversized late-'80s issues is always worth it.