Danielle Turchiano Senior Features Editor, TVSPOILER ALERT: Do not read if you have not yet watched “Brave New World,” streaming now on Peacock.Alden Ehrenreich is no stranger to stepping into the worlds of iconic intellectual property: In 2013 he starred in the big-screen adaptation of Kami Garcia and Margaret Stohl’s “Beautiful Creatures” and in 2018 joined the “Star Wars” universe as the titular Han Solo in “Solo: A Star Wars Story.” Now, comes his first television series regular role as