Today's Fact
Checked against independent sources — the issues are cited below.
Halloween suits this one. In Captain America #402–408 (1992), the "Man and Wolf" arc by Mark Gruenwald and Rik Levins, Steve Rogers investigated the disappearance of his friend John Jameson and a string of werewolf killings around Starkesboro, Massachusetts. Captured by the villainess Nightshade, he was dosed with her wolf serum and woke up transformed: fur, fangs, claws and a tail, still wearing the stars and stripes. The history books remember him as Capwolf.
A serum that rewired everyone else into obedient beasts barely dented Rogers. Accounts of the arc credit the Super-Soldier Serum in his blood with preserving his free will inside the wolf shape, and Wolfsbane, herself a prisoner in Dredmund’s pit, taught the muzzled Avenger how to shape words through a wolf's throat again.
Speech restored, Capwolf did the most Captain America thing available to a detainee: he organised the other captives. He rallied Jameson's Man-Wolf, Werewolf by Night and the rest of the penned monsters into an escape, then helped tear the moonstone from the cosmic werewolf Starwolf and crush it, ending Dredmund’s scheme before an antidote returned him to human shape.
Why It's Obscure
For six issues the Sentinel of Liberty had paws, and the strangest part is how little the fur changed his job description.
Gallery
Comic art of Captain America and the figures named in today's fact.



Sources
Every claim above checks out against at least two of these independent sources.
Bullpen Bulletins
- Man and Wolf — WikipediaSynopsis and credits for Captain America #402–408 (1992): Nightshade transforms Captain America into a werewolf, and he leads the captive were-creatures against Dredmund and Starwolf.
- Captain America: How Capwolf Turned the Avenger Into a Werewolf — CBRCBR retells the arc issue by issue, including the Super-Soldier Serum preserving Rogers' free will and Wolfsbane teaching him to speak in wolf form.