If you haven’t seen Avengers: Age of Ultron don’t read this.
Initial assumptions: that you know who Thor, Ultron and the Vision are. If you don’t, this post won’t interest you anyway. Move along.
Now, the inscription on Thor’s hammer Mjolnir goes thus:
“Whosoever holds this hammer, if he be worthy, shall possess the power of Thor.”
We’ll come back to that in a minute.
In the movie Age of Ultron, in a party scene, most of the Avengers in turn try to lift Mjolnir. Captain America shifts it slightly, everybody else fails.
(You’ll note that in the previous Avengers film, the Hulk tried and failed. Also, if you saw the first Thor movie, Thor himself loses his powers when he becomes unworthy)
Later in the movie Quicksilver tries to snatch the hammer. Bad idea, as you can imagine.
Towards the third act of the film the Vision casually lifts the hammer and hands it to Thor. Note: the Vision does not receive the power of Thor.
This led to all kinds of arguments in the geekosphere about whether Vision was worthy or not.
The power of Thor is the key issue.
Here’s my take:
It had nothing to do with Vision’s worthiness. People often forget the actual enchantment. If you are worthy you won’t just lift the hammer, but you’ll have the power of Thor. See Beta Ray Bill, a worthy guy who lifted the hammer after fighting Thor for it.
Vision is not truly alive and that is why he could carry the hammer, like an elevator (as they mentioned at the end of the film). You put the hammer on the floor of an elevator and push the button, the elevator lifts it to the next floor. The “aliveness” of Vision has always been a lively and contradictory discussion.
Key point: Vision does not get the power of Thor even though he lifts the hammer. Neither does the elevator.