In the autumn of 2010 Valheim Hagen played Edmund Tyrone in the Riksteatret's production of Eugene O'Neill's Lang dags ferd mot natt (Long Day's Journey into Night). Liv Ullmann played his mother, Mary Tyrone, and Sundquist played his father, James Tyrone. In an article about this production, a Writer for Dagbladet noted that Sundquist had played Falstaff to Valheim Hagen's Prince Hal in 2008, and that they had played father and son the year after in the film Jernanger, “in roles that were too small for their talents.”