13 Best Secret Cameos In Marvel Movies

5. Matt Damon - Thor: Ragnarok

It was rather unfortunate that it was spoiled for some fans ahead of release, but the secret cameos of Matt Damon, Luke Hemsworth and Sam Neill were still a truly great moment in the history of the MCU.

Seeing an actor of Damon's standing, in particular, turning up for a brief role as the actor playing Loki (badly, rather hilariously) was completely shocking. The melodramatic, over-blown performance was the icing on the cake after he appeared and it's still incredible that Taika Waititi pulled it all off.