#1 Sgt Slaughter - G.I. Joe: A Real American Hero
One of the most patriotic stars in WWF history, Sgt. Slaughter stood for the red, white and blue at almost all points of his illustrious career.
So during 1985, when G.I. Joe: A Real American Hero needed a real-life wrestler to join their ranks, the WWF leapt at the opportunity to include Slaughter into the show.
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As a cartoon character, the former WWF Champion became a massive star outside of the ring, aiding the Joes in their fight against the villainous Cobra Commandos.
In fact, it was Slaughter's antics on the show that made his action figure the best selling toy of the entire series.
Back in the ring, Slaughter would receive some success, capturing the WWF Championship briefly, though bizarrely as a heel who hated America, which must've confused those who only knew him for his time helping the Joes.