• Milo Ventimiglia, Mandy Moore, Sterling K. Brown and Justin Hartley speak onstage during the 'This Is Us' panel at Entertainment Weekly's PopFest at The Reef in Los Angeles, California.

Milo Ventimiglia, Mandy Moore, Sterling K. Brown and Justin Hartley speak onstage during the 'This Is Us' panel at Entertainment Weekly's PopFest at The Reef in Los Angeles, California. (Photo : Getty Images/Alberto E. Rodriguez)

Tensions are high between Jack Pearson (Milo Ventimiglia) and Rebecca Pearson (Mandy Moore) in "This Is Us" Season 1 episode 17 titled "What Now?" The latter will leave on tour with her band.

In episode 15 titled "Jack Pearson's Son," Jack found out that Rebecca dated a member of her band so he did not want her to go on tour with the band. They had a fight and the former had his first drink in several years.

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While Jack and Rebecca's relationship appears to be on the rocks, the relationship of Kevin Pearson (Justin Hartley) and Sophie (Alexandra Breckenridge) will deepen on the premiere night of Kevin's play in "What Now?" The entire Pearson family will gather at the place of Randall Pearson (Sterling K. Brown) for an unusual party.

Kate Pearson (Chrissy Metz) also has a struggle of her own. She will have a hard time openning up to Toby Damon (Chris Sullivan) about her father's death.

Joining Ventimiglia, Moore, Hartley, Breckenridge, Brown, Metz and Sullivan in "What Now?" are Susan Kelechi Watson as Beth, Julia Cho as Jill, Faithe Herman as Annie Pearson, Ken Lerner as Brandon Novak, Anthony Marciona as Pench and John Pollono as Tyler. Niles Fitxh, Amanda Leighton and Logan Shroyer will play 15-year-old Randall, teenage Sophie and 15-year-old Kevin, respectively.

"What Now?" will air on March 7, Tuesday, on NBC. In the next episode titled "Moonshadow," Jack will go to Cleveland to make things right with Rebecca during the first night of her gig. 

Aside from playing Jack in "This Is Us," Ventimiglia is also set to star in the sci-fi thriller film titled "Devil's Gate," which will hit theaters in April. Among his co-stars are Shawn Ashmore, Bridget Regan, Amanda Schull, Javier Botet, Jonathan Frakes, Adam Hurtig, Beverly Ndukwu and Sarah Constible.

Watch an interview with Ventimiglia on "Live with Kelly" with "Scream Queens" alum Jerry O'Connell as guest co-host here: