On today's What to Watch: Nick and Vanessa Lachey host the new relationship reality series The Ultimatum: Marry or Move On, where one person in a couple is ready to marry but the other isn't, so they get to choose a partner to live with for a trial marriage to help decide their relationship's fate. Ethan Hawke tells us about his villainous turn in the Disney+ Marvel series Moon Knight, where Oscar Isaac plays the titular mercenary; and on TLC's new docuseries Body Parts, an anaplastologist combines her love of biology and art to make specialty prosthetics for people who've lost body parts, everything from arms, ears, even eyes. Plus, entertainment headlines — including the cast of Star Trek: The Next Generation reprising their roles on the third and final season of Star Trek: Picard, another international version in the RuPaul's Drag Race franchise, and the death of former teen idol and actor Bobby Rydell — and trivia.

More at ew.com, ew.com/wtw, and @EW.

Host/Producer: Gerrad Hall (@gerradhall); Editor/Producer: Joshua Heller (@joshuaheller); Writers: Tyler Aquilina (@tyler_aquilina) and Calie Schepp; Executive Producer: Chanelle Johnson (@chanelleberlin).

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