VIDEO: Sneak Peek - 'The Big Three' Episode of NBC's THIS IS US

On the next episode of NBC's new drama THIS IS US titled 'The Big Three', Kate (Chrissy Metz) is furiously working hard to shed her unwanted pounds as she continues to struggle with impatience and discouragement. She receives support from her new boyfriend, Toby (Chris Sullivan), as he helps her let loose and enjoy herself. Beth (Susan Kelechi Watson) begins to question the motives of Randall's (Sterling K. Brown) biological father, William (Ron Cephas Jones), and takes action in getting answers on his activities.

Randall has a lot more on his mind with the new life-changing addition of having his biological father in his life. Marriage and raising three 8-year-old children is beginning to take its toll on Rebecca (Mandy Moore) and Jack (Milo Ventimiglia) as they start to feel distant from one another. Kevin (Justin Hartley) faces the aftermath of quitting his job as he deals with his agent, Lanie (Katey Sagal), and has to figure out how to move forward. The episode airs Tuesday, September 27th at 10:00 pm. Get a sneak peek below!

Sometimes life will surprise you. Starring Mandy Moore (“A Walk to Remember”), Milo Ventimiglia (“Heroes,” “Gilmore Girls”) and Sterling K. Brown (“The People v. O.J. Simpson: American Crime Story”), this refreshingly honest and provocative series follows a unique ensemble. As their paths cross and their life stories intertwine in curious ways, we find that several of them share the same birthday, and so much more than anyone would expect. From the writer and directors of “Crazy, Stupid, Love.” comes a smart, modern dramedy that will challenge your everyday presumptions about the people you think you know.

Chrissy Metz, Justin Hartley, Chris Sullivan, Susan Kelechi Watson and Ron Cephas Jones also star.

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