Welcome back, Loki.

With the help of an assistant, Tom Hiddleston puts on his Marvel character's iconic, long black wig in a new video shot in his dressing room on the Australian set of Thor: Ragnarok—and for a great cause!

The clip was filmed to raise awareness for UNICEF's #EmergencyLessons campaign. Hiddleston, one of the international charity's celebrity Goodwill Ambassadors, talks a film the group shot in Guinea, featuring friends M'mah & Adamah, who survived an Ebola outbreak.

The epidemic had prompted many schools in the area to close but with the help of a program co-sponsored by UNICEF and the EU, the girls were able to continue their education, according to the European Union Humanitarian Aid and Civil Protection group.

In the video, Hiddleston also reveals his favorite school activity—acting in plays.

"I'm still doing it for a living, as you can see," the British star says. "The Loki wig is on. He's back. See you soon."