Also airing: ‘Deadwood’ returns as an HBO movie.

“Blindspot”

Two-part season-four finale; in the first episode, Dominic begins to enact Madeline’s cataclysmic scheme as the team rushes to stop him, and tensions rise as past secrets begin to unravel; in the final episode, the team is on an international mission to stop an attack from spreading, and conflicts threaten relationships within the team; series renewed for a fifth and final season; 8 p.m. Friday on KING.

Also on Friday

“Masters of Illusion 21st Anniversary Special,” 8 p.m. (KSTW): Dean Cain hosts special featuring new magic and special moments from “Masters of Illusion;” performers include Murray SawChuck, Greg Frewin, Mac King, Franz Harary, Barry and Stuart, Farrell Dillon, Naathan Phan and Jonathan Pendragon.

“Whistleblower,” 8 p.m. (KIRO): A couple believe a secretive polygamist sect might be defrauding the government on a massive scale; a federal investigation leads to an indictment.

“Deadwood: The Movie,” 8 p.m. (HBO): A new chapter in the history-based Western series, canceled in 2006 after three seasons, is set 12 years after the series finale, as the town celebrates South Dakota’s statehood.

“Marvel’s Agents of S.H.I.E.L.D.,” 8 p.m. (KOMO): Yo-Yo and Keller take things public; parasitic aliens threaten the human race.

“Monrovia, Indiana,” 9 p.m. (KCTS): Filmmaker Frederick Wiseman documents the day-to-day experiences of living and working in the farming community of Monrovia, Indiana.

“20/20,” 9 p.m. (KOMO): New details about the 2010 murders of Sam Herr and college student Juri “Julie” Kibuishi, including Daniel Wozniak’s confession, his motive and fate as he sits on death row.

“Unidentified: Inside America’s UFO Investigation,” 10 p.m. (HISTORY): Former U.S. government insiders team up to reveal what the government knows about UFOs, led by Luis Lue Elizondo, who ran the U.S. government’s $22 million secret UFO investigation program.

“The Graham Norton Show,” 11 p.m. (BBCA): Guests are the stars of Marvel’s “Dark Phoenix,” Jessica Chastain, Michael Fassbender, Sophie Turner and James McAvoy.

Madeline McKenzie: mmckenzie@seattletimes.com. Program times may vary depending on your cable provider or service.