Which company, headed by Thomas Tull, produced the 2013 film that was the first installment in the DC Extended Universe?
Thomas Tull:  His firm has produced and/or financed several major motion pictures, including "The Dark Knight Trilogy", "The Hangover" and its sequels, "300", "Man of Steel" and others. Man of Steel (film):  It is the first installment in the DC Extended Universe (DCEU).
i don't know