“Ant-Man” was originally meant to have a different ending, says the director. Peyton Reed told Cinema Blend that the last scene was supposed to have a fight between Ant-Man (Paul Rudd) and the S.H.I.E.L.D member Mitchell Carson (Martin Donovan).

“At the end of the movie he gets away and has these Cross particles, and there was a sequence where Ant-Man has an encounter with him. But then for a couple reasons, it felt like maybe we should leave those particles out there. In that original thing, he took Martin Donovan out and got the particles,” he said.

[Warning: Spoilers Ahead]

In the film, Carson is a secret HYDRA agent and wants to buy the Yellowjacket from Darren Cross (Corey Stoll) but Ant-Man disrupts the deal. 

The ending was reportedly changed as Ant-Man is set to appear in “Captain America: Civil War.” In the present version of the film it has been left open-ended. It shows Luis (Michael Pena) telling Scott Lang/Ant-Man that the Avengers have been looking for him. Lang will participate in the civil war with the Avengers, but it is not known whether he will side with Captain America (Chris Evans) or Iron Man (Robert Downey Jr.).

Rudd has already shot his scenes in the film and is excited to appear alongside other Avengers. “To be in that Marvel world, but kind of be somewhat in a bubble [on the solo movie] and now to kind of have these experiences where I’m standing opposite Captain America, it’s been a surreal ride so far,” Superhero News quoted the actor saying.

“Ant-Man” concerns Lang, who wears the Ant-Man suit to battle evil forces. The film also stars Evangeline Lilly, Corey Stoll, Bobby Cannavale, Tip "T.I." Harris, Anthony Mackie, Wood Harris, Judy Greer, Michael Douglas and David Dastmalchian. Kevin Feige has produced it and it has made $113 million till date.