Though he was never advertised as part of the film's cast, there were likely more than a few audience members who walked out of the screening of "Avengers: Age of Ultron" wondering where Thor's brother, Loki, was during the events of the sequel.

Not so Tom Hiddleston. The man who brought the trickster god to life in three prior Marvel Studios films was recently promoting his upcoming starring turn in Guillermo del Toro's horror film "Crimson Peak," when discussion turned to "Age of Ultron" and the actor's much-rumored cameo.

REVIEW: "Avengers: Age of Ultron" Benefits from Home Viewing

"I was part of the dream sequence for the character of Thor, and I shot for a day and enjoyed it very much," Hiddleston readily confirmed for Digital Spy. "I received a phone call from [Marvel Studios President] Kevin Feige -- actually, Joss [Whedon] emailed me. But basically, Kevin said -- and I'm just going to tell you the truth, because it's the cleanest way of doing it -- in test screenings, audiences had over-emphasized Loki's role. So they thought that because I was in it, that I was controlling Ultron."

"Avengers: Age of Ultron" -- sans Tom Hiddleston -- is available now on DVD, Blu-ray and digital download. "Crimson Peak" haunts theaters Friday, October 16.