Watch Clark Gregg's Toxic Vs. Hayley Atwell's Bad Romance On Lip Sync Battle

After teasing fans with a couple preview videos, the Marvel showdown finally happened. Marvel's Agents of S.H.I.E.L.D. star Clark Gregg took on Agent Carter herself, Hayley Atwell, on Spike's Lip Sync Battle.

Spike released a video showing both actors' fully costumed performances, with Gregg performing Britney Spears' "Toxic" and Atwell performing Lady Gaga's "Bad Romance." They're both performances you are not likely to forget.

Also, see if you can spot the Dirty Dancing Easter egg in Gregg's performance (his wife).

Marvel's Agents of S.H.I.E.L.D. is entering its four-part Season 3 finale arc, "Fallen Agent," beginning with next week's episode, "The Singularity." Marvel's Agents of S.H.I.E.L.D. airs Tuesdays at 9 p.m. on ABC.

Agent Carter finished its second season early in 2016. ABC has yet to announce a Season 3 renewal.