Chris Hemsworth and Tom Hiddleston are two of the most popular characters in the Marvel Universe.
The two actors decided to take a break from filming Thor: Ragnarok to visit some sick children in hospital in Brisbane, Australia, reports The Lad Bible.
As a treat, they came in character as Thor and Loki where Hemsworth even brought Thor's hammer.
Hemsworth wrote on Twitter: "Met the real superheroes of the world at Lady Cilento Children's Hospital. A huge shout out to these brave kids."