Scarlett Johansson and her ample cleavage are here to save the day!

We got our hands on the first clip from "The Avengers," showing ScarJo in action as Natasha Romanoff, AKA Black Widow.

In the clip, Scarlett impressively takes out a gang of captors while handcuffed to a chair ... all while wearing a pretty revealing dress!

Looks like she'll be able to hold her own alongside The Hulk, Thor, Captain America, Iron Man and Hawkeye.

We also got the first glimpse at the S.H.I.E.L.D. Helicarrier, Nick Fury's (Samuel L. Jackson) base of operations, in the new clip below.

"The Avengers" assemble in theaters on May 4.

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