Ele fazia parte da missão de visão de Thor
Tom Hiddleston discutiu isso em uma entrevista de 2015 com o Digital Spy:
Transcrição:
Hiddleston: I was part of the dream sequence for the character of Thor, and I show up for a day, and enjoyed it very much, and then I received a phone call from Kevin Feige [something about getting an email from Joss Whedon that I can't decipher], but basically Kevin said - and I'm just going to tell you the truth because it's the cleanest way of doing it - that in test screenings, audiences had sort of over-emphasized Loki's role so they thought that because I was in it that was controlling Ultron, and that it was actually imbalancing people's expectations. So Joss and Kevin were like 'We've got to...let's cut it because it's confusing people'
Joss Whedon deu mais detalhes em uma apresentação de 2015 no Império Podcast, dizendo que a cena incluiu Hiddleston fazendo sua melhor imitação de Anthony Hopkins (que interpreta Odin):
We even had a little reference to the fact that he’s taken the throne, which was Tom doing his Anthony Hopkins impression when Thor says, 'Oh, what would father say?' Then Tom does his Hopkins impression, and Thor’s like, 'That is uncanny!' It’s sort of like his subconscious is telling him that Loki was imitating his father.
Até onde eu sei, essa cena nunca foi disponibilizada publicamente; a edição especial Blu-Ray (que eu não tenho, porque as guerras de formato são burras) contém um número de cenas deletadas, mas aparentemente não tinha esse .