David Muir, the former anchor of “ABC World News” weekend edition, takes the duty of navigating the weekday report of breaking news, taking the position previously held by other well-known journalists: John Daly, Frank Reynolds, Howard K. Smith, Harry Reasoner, Barbara Walters, Peter Jennings, Charles Gibson, Bob Woodruff, Elizabeth Vargas and — most recently — Diane Sawyer.

Cast: David Muir