They join forces to battle it out against the baddies in their four films together under the Marvel umbrella.
But it was Scarlett Johansson on the receiving of a sneak attack from co-star Chris Evans during her appearance on Thursday’s episode of The Ellen DeGeneres Show.
The 30-year-old actress belted out a hearty scream after her hunky 33-year-old co-star snuck up behind her and yelled while she was chatting with the talk show host.
Sneak attack: Scarlett Johansson was caught off guard when Chris Evans scared her during Thursday’s episode of The Ellen DeGeneres show
The Lost In Translation actress definitely was a good sport about the gag as she welcomed the actor with a big hug despite appearing to still be in a panicked state.
Just before the prank, the blonde beauty described their working relationship to the 57-year-old host: ‘I think this is our fifth movie. We’ve been working together since we were like 17, I think, or something like that.’
Spooked: the 30-year-old actress put her hands over her mouth in embarrassment after the gag
The duo first worked together on 2004 teen comedy The Perfect Score as Scarlett added: ‘I know him very well. Too well I’m sure.’
Scarlett looked lovely in a casual chic look as she donned a flowy blue top with black trousers and had her short blonde locks elegantly dishevelled.
Chris was dressed perfectly for the sneak attack as he donned a pair of black socks to keep his footsteps quiet along with navy blue trousers, a brown shirt and a black leather jacket.
Good sport: The blonde beauty gave the hunky 33-year-old star a welcoming hug after the prank
Dynamic duo: Scarlett appeared to be genuinely shocked as they laughed about it together
Earlier in the interview, the Lucy actress discussed her pregnancy and being a mother for the first time as she gave birth to daughter, Rose Dorothy, back in September.
She was actually pregnant while shooting The Avengers: Age Of Ultron, which prompted Ellen to ask: ‘Do you think you’re supermom?’
Scarlett played coy as she replied: ‘Certainly not. No. I would never assume that title. No. Although you know I certainly actually shot this film while I was pretty pregnant.
Fancy to see you here: Chris also sat down with the 57-year-old talk show host as they chatted it up and even played a fun game together
‘Which was is kind of crazy. I never thought I would be doing this movie. It was mind blowing. Very strange.’
The blonde beauty enjoyed the experience of being on set during the filming of the highly-anticipated action flick as she added: ‘I don’t know I was happy. Like I said I was super happy to be working. And everybody had to be nice to me. Which was cool.’
Supermom? Scarlett also discussed being a mother to eight-month-old daughter Rose Dorothy and even shared what it was like to be pregnant on the set of her latest flick
Scarlett and Chris’s upcoming superhero flick features a star studded cast also including: Robert Downey Jr, Chris Hemsworth Mark Ruffalo, Jeremy Renner, James Spader, Samuel L. Jackson, Don Cheadle, Elizabeth Olsen, Cobie Smulders, Anthony Mackey, Aaron Taylor-Johnson and Paul Bettany.
The Avengers: Age Of Ultron hits cinemas in the US on Friday.
Back in the day: Chris and Scarlett have had quite a history together as they starred with one another in 2004 teen comedy The Perfect score. as they are seen with co-star Bryan Greenberg (pictured left)
Assemble: The duo are just two members of the star-studded cast of The Avengers: Age Of Ultron which is set for release in the US on Friday