Blink, and you'll miss it.

Close your eyes and stop reading now if you don't want to know what it is.

The new Spanish-language TV commercial for "Ant-Man" unveils what's being called a spoiler, with one of the characters from "The Avengers" -- Falcon, played by Anthony Mackie -- flashing on the screen. It happens 18 seconds in and is gone, without context or explanation. (Check out the ad below).

Of course, Marvel always populates its movies with characters from other films, and anyone reading IMDB will know this is no surprise: Mackie's listed in the credits playing "Sam Wilson/Falcon." But this is the first video proof.

To find out what role Falcon plays, audiences will have to wait until Friday, when "Ant-Man" opens nationwide starring Paul Rudd.

https://youtu.be/nLK7LVCOsLg