With nearly 80 years of history under his belt, Captain America has seen it all. Time travel, aliens, gods and monsters are nothing to the Star-Spangled Avenger. Considering his countless experiences, it should be no surprise that Steve Rogers once became a werewolf.
Cap's strangest transformation took place in Captain America #402-408, by Mark Gruenwald and Rik Levins. The story began when Colonel John Jameson went missing. Leading the investigation, Cap found several alarming pieces of evidence. For one thing, there had been a recent series of werewolf killings. Since Jameson used to transform into the bloodthirsty Man-Wolf, Rogers had reason to believe the worst. Additionally, the moonstone, that which transformed Jameson into Man-Wolf, was missing. Bringing along fellow Avenger Dr. Druid, The Sentinel of Liberty set out to investigate the site of the latest werewolf murder.
Once there, the two Avengers were attacked by Ferocia, a wolf native to the mystical city of K'un-Lun. Before Cap could get his bearings, Moonhunter emerged, battling the Avenger before fleeing with Ferocia in tow. Ferocia was delivered to Dr. Nightshade, who was using Jack Russel, The Werewolf by Night, to recreate the wolf serum. This plot was orchestrated by Dredmund, The Demon Druid, who used the moonstone to draw any werewolves and feral superhumans to his headquarters in Starkesboro.
As a result, Wolverine came to Starkesboro, fighting off the town's rabid werewolves until he was captured by Moonhunter as well. Due to The X-Man's healing factor, however, he was immune to the wolf serum. Even so, Dredmund used his powers to mesmerize Logan so he would attack Cap long enough to tranquilize him. Waking up in Nightshade's lab, Cap found himself transformed into a werewolf by the wolf serum.
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Despite turning into "Capwolf," Rogers maintained his free will, thanks to The Super-Soldier Serum. Dredmund summoned his army of werewolves to chase Capwolf, realizing the threat he posed. Fighting off Wolverine, Capwolf managed to escape Dredmund's clutches.
Unfortunately, Cap fell under the control of Nightshade's pheromones, leading him into the wolf pit. Once there, Cap was forced to fight John Jameson in his Man-Wolf form. When Capwolf won, he gained the respect of the other werewolves. X-Factor's Wolfsbane taught Cap to speak in his new form, and he began an uprising.
Leading his fellow werewolves, Capwolf captured Nightshade and Moonhunter. Meanwhile, Dredmund defeated Dr. Druid in a mystical battle and prepared him for an unholy ritual. Slashing Dr. Druid's throat on the moonstone, Dredmund became Starwolf, a cosmically-powered werewolf. In the midst of the pandemonium, Cable arrived to rescue his X-Force teammate, Feral.
As the heroes fought Starwolf and his lackeys, Dr. Druid awoke to free Wolverine and Moonhunter from Dredmund's control. Aided by his fellow heroes, Capwolf managed to rip the moonstone from Starwolf's throat. Cap crushed the moonstone and turned Dredmund back to normal. Man-Wolf also forced Nightshade to find an antidote for the wolf serum, after turning the doctor into a werewolf herself.
The storyline finished up as an "Infinity War" tie-in. Indeed, an evil Captain America doppelganger teleported in and attacked his counterpart. Cap was reverted to normal just in time to destroy his warped doppelganger. With the adventure completed, Moonhunter gave Cap and Dr. Druid a ride back to Avengers Mansion.
Even through some of his weirdest adventures, Captain America always finds a way to triumph.
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