During the Credits
As Marvel Studios President Kevin Feige previously confirmed, there is in fact a brief extra scene during the credits of Avengers: Age of Ultron. It begins about two minutes after the credits begin. Check out full details hidden below.
In the extra scene, the camera fades in on the Infinity Gauntlet with no Infinity Stones in its slots. A door opens up behind the glove, and a hand grabs it. The camera then pans up to reveal Thanos (Josh Brolin), who says, “Fine. I’ll do it myself.” He puts on the Infinity Gauntlet, walks away, and the scene cuts to black. The stinger lasts about half a minute.
After the Credits
Those who have attended early pre-screenings have confirmed that director Joss Whedon was not lying when he said that there is no stinger after the credits of Avengers: Age of Ultron.
The “leaked” extra scene with Spider-Man has also been confirmed by its creators as a prank.
Special thanks to reshef316, Mac, Rossatron, Cid, and Jack for the stinger submissions!