Clark Gregg Doing Britney Spears' "Toxic" on Lip Sync Battle Is a Dream Come True

It's a Marvel showdown on this Thursday's Lip Sync Battle.

Clark Gregg, who plays Phil Coulson on Marvel's Agents of S.H.I.E.L.D., squares off against Hayley Atwell (Peggy Carter on Marvel's Agent Carter) in the next episode of the show... And if this clip Spike released is any indication, it looks

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• Lip Sync Battle
• Clark Gregg
• Hayley Atwell

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