Rachel McAdams (Sigrit Ericksdottir), Will Ferrell (Lars Erickssong), Pierce Brosnan (Erick Erickssong), Dan Stevens (Alexander Lemtov), Jamie Demetriou (Kevin Swain), Ólafur Darri Ólafsson (Neils Brongus), Melissanthi Mahut (Mita Xenakis) more..., Joi Johannsson (Jorn), Björn Hlynur Haraldsson (Policeman - Arnar), Graham Norton (Graham Norton), Demi Lovato (Katiana), Jóhannes Haukur Jóhannesson (Johans), Bobby Lockwood (Jeff), Elena Saurel (Stage Manager), Julian Miller (Janus Skoene (uncredited)), Mikael Persbrandt (Victor Karlosson), Jon Kortajarena (Corin Vladvitch), Elina Alminas (Sasha), Alfrun Rose (Anna), Elin Petersdottir (Helka), Christopher Jeffers (Johnny John John), Rebecca Harrod (Brittny), Josh Zaré (Bill), Eleanor Williams (Jenn), Björn Stefánsson (Ian), Maxim De Villiers (French Voter), Chris Lew Kum Hoi (Jae-Bong), Tómas Lemarquis (Jiles), Smari Gunn (Lighting Assistant), Kajsa Mohammar (Lisa), Gudmundur Thorvaldsson (Man #1 (1974)), Arnar Jónsson (Man #2 (1974)), Natasia Demetriou (Nina), Hannes Óli Ágústsson (Olaf Yohansson), Hlynur Þorsteinsson (Policeman - Robert), William Lee Adams (William Lee Adams), Heidi Niemi (Stage Manager 2), Chris Beaumont (Steve Gunderson), Laura Hayden (The Wonder Four), Joshua Rumble (The Wonder Four) and others.

Anna B. Sheppard (Costume Designer), Greg Hayden (Editor), Will Ferrell (Producer), Will Ferrell (Writer), Paul Inglis (Production Design), Allison Jones (Casting), Danny Cohen (Director of Photography) more..., Adam McKay (Executive Producer), Atli Örvarsson (Original Music Composer), Jessica Elbaum (Producer), Daniel M. Stillman (Executive Producer), Chris Henchy (Producer), Nigel Evans (Art Designer), Andrew Steele (Executive Producer), Andrew Steele (Writer), Naomi Moore (Set Decoration), Eitan Evan (Producer), Ketan Waikar (Art Direction), Molly Sandén (Vocals), Andri Fannar Kjartansson (Camera Trainee), Jon Ola Sand (Executive Producer), Nadja Burkhardt (Executive Producer), Jan Hermenau (Executive Producer), Rickard Göransson (Songs), Rickard Göransson (Lyricist), Fat Max Gsus (Songs), Savan Kotecha (Songs), Savan Kotecha (Lyricist), Demi Lovato (Songs), Catherine Harper (Foley Artist), Nina Gold (Casting), Sharon Martin (Makeup Artist), David Giammarco (Sound Re-Recording Mixer), Paul Massey (Sound Re-Recording Mixer), Bridget Cook (Hairstylist), Ragna Fossberg (Hairstylist), Julie Feiner (Dialogue Editor), Maxine Dallas (Makeup Artist), Marc Glassman (Sound Effects Editor), Autumn Butler (Makeup Artist) and others.