By Danielle Zhu
Updated October 05, 2015 at 05:13 PM EDT

Our favorite Dubsmashing Marvel actors are taking their friendly competition to the stage. Agent Carter‘s Hayley Atwell and Agents of S.H.I.E.L.D.‘s Clark Gregg will appear on Lip Sync Battle to settle their rivalry once and for all (“to the death!”).

Their appearance is no doubt prompted by the ongoing Dubsmash battles between Team Carter and Team S.H.I.E.L.D., which began during Comic-Con and evolved into Dubsmash Wars for Charity. Atwell and Gregg, along with their costars James d’Arcy and Chloe Bennet, launched the contest to benefit Stomp Out Bullying! and St. Jude’s Children’s Research Hospital. Fans vote by donating money to their team’s respective charity, and nearly $100,000 has been raised.

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The final round of Dubsmash Wars will begin Wednesday on Crowdrise. Both teams will post their videos at the same time, and the winner will be declared Oct. 16.

Watch the exclusive Lip Sync Battle announcement from Atwell and Gregg above. Their episode will air sometime in 2016 when the Spike series returns.