Tom Hiddleston's Loki was cut from 'The Avengers: Age of Ultron' because his appearance confused test audiences.
Hiddleston was set to make a small cameo in the 2015 film but it was cut when the film's first viewers thought it showed Loki was controlling Ultron.
He told Variety: "As they were testing the film, the initial audiences were like, 'Oh, Loki is controlling Ultron!'
"And Kevin Feige [Marvel Studios president] and all the guys at Marvel were like, 'Um, no, he's not'. So they just thought it was confusing."
Meanwhile, Tom recently reprised his role as Loki for 'Thor: Ragnarok' and likened it to "seeing an old friend again".
He shared: "It's amazing to be back, amazing. I've only shot for about a week but it's so much fun, because I haven't played the character for three and a half years and the script is brilliant, [director] Taika Waititi is brilliant. I've shot a couple of scenes and it's just the best fun. It is like seeing an old friend again."
Meanwhile, Tom previously suggested that 'Thor: Ragnarok' would be the last time he plays Loki.
He said: "'Thor 3' will be cool because I've not done it for four years. I love working with Chris. This will be my last time out of the gate."
Asked about the possibility of being in 'The Avengers: Infinity War', he added: "I don't know! Honestly, I don't know. They haven't got their ducks in a row yet. They make it up as they go along."
And Tom is also set to appear in 'Kong: Skull Island' and is excited about the prospect as it is so different to any other role he has played.
He said: "It's cool, it's gonna be new this time. 'Kong' was a change, to play a heroic protagonist - having never really played that role before - in a massive movie. And Jordan's vision for it is really unique: completely different time period, different story, and 'Kong' like you've never seen him before."
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