Watch the official "This Is The One" clip from This Is Us Season 6 Episode 18. The NBC drama series stars Milo Ventimiglia, Mandy Moore, Sterling K. Brown, Chrissy Metz, Justin Hartley, Susan Kelechi Watson, Chris Sullivan, Jon Huertas, Alexandra Breckenridge and Gerald McRaney.<br /><br />This Is Us Season 6 is streaming now on Peacock!
