Wolverine is one of Marvel's most fearsome characters. Although he's historically been one of the X-Men's most prolific and important heroes, he's also long struggled with his dark side, battling with the beast within to remain a man above all else. But in some realities, this is a losing battle that eventually ends with Logan returning to a more animalistic state.
Source:https://www.cbr.com/x-men-what-if-inferno-wolverine-monster-marvel/