Eel

A slippery, electrically-suited criminal who clashed with Daredevil in the mid-1960s, the Eel used a specially designed costume capable of delivering powerful electric shocks to make himself a formidable — and hard-to-grab — foe for the Man Without Fear.

Slithering out of the Silver Age in 1965, Eel made their Marvel debut in the pages of Daredevil #6 under the legendary creative hands of Stan Lee and Wally Wood — a pedigree that alone makes this character worth a second look. With two key issues to their name and a publishing history stretching across an remarkable six decades to 2026, Eel has proven surprisingly durable for a figure who might seem like a footnote. Their adventures have wound through titles as varied as The X-Men, Captain America, and Ed Brubaker's celebrated Captain America run, sharing panels with heavy-hitters like Spider-Man, Beast, and Leopold Stryke along the way — and, notably, this is a card-carrying Avenger. Twenty-one catalog appearances may not sound like a crowd, but for a Silver Age Marvel creation still turning up in modern comics, Eel is exactly the kind of deep-cut discovery that reminds you why collectors keep digging.