The theory of Evolution: photos | WWE

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Evolution began at Unforgiven 2002 when Ric Flair aligned himself with World Heavyweight Champion Triple H.

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Batista and Randy Orton joined the group on Jan. 20, 2003 by helping Triple H and Flair put a beating on Scott Steiner.

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The four Superstars officially adopted the name Evolution, representing the past, present and future of WWE.

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Shortly after their formation, Evolution was dealt a blow when both Orton and Batista were sidelined with injuries.

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The Viper returned on the May 26 episode of Raw, the first sign that Evolution was regaining their strength.

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Batista returned that October and destroyed The Game's rival, Goldberg.

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Orton, Flair and Batista bested The Rock 'n' Sock Connection at WrestleMania XX.

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The Viper was dismissed from Evolution after winning the World Heavyweight Title.

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Batista left Evolution after setting his sights on The Game's World Heavyweight Championship.

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Triple H, Flair and Batista reunited on the 15th anniversary of Raw to take on Rated-RKO and Umaga.

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