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"If you think you know what's coming next you don't know us," the trailer teases.

It looks like "This Is Us" Season 4 will feature more than just the Pearson family.

On Saturday morning, in honor of the Big Three's birthday, NBC dropped a star-studded teaser for the new season and introduced multiple new characters joining the cast.

The trailer opens to Mandy Moore's Rebecca Pearson talking in a car with future husband Jack, played by Milo Ventimiglia.

"It's so strange, isn't it? How just like that a complete stranger can become such a big part of your story," Moore's character says.

"It's actually kind of terrifying, you know, how a single cross with one person you've never met can change everything,” she adds.

Flashes of the fresh faces begin to appear. Although it's still under wraps who these new characters are, we do know they are played by known stars, including "Once Upon a Time" actress Jennifer Morrison, Nick Wechsler ("Revenge"), Omar Epps ("House"), and "Now They See Us" actors Asante Blackk and Marsha Stephanie Blake.

More new stars joining the cast are "Psych's" Timothy Omundson, Bahara Golestani ("Animal Kingdom"), Julian Silva ("Queen of the South"), and "Bull" actor Auden Thornton.

Another famous face who pops up in the teaser? Director M. Night Shyamalan. Some are predicting that the Oscar-nominated director, who is known for his wild twists, could actually be playing himself and will be working with Kevin Pearson (Justin Hartley) on his new role World War II film co-starring Sylvester Stallone.

In addition to Moore, Ventimiglia and Hartley, main cast members Sterling K. Brown, Chrissy Metz, Susan Kelechi Watson and Chris Sullivan are all returning. Reaccuring guest stars Griffin Dunne, Tim Jo, Ron Cephas Jones, Elizabeth Perkins, Phylicia Rashad and Caitlin Thompson will also be back for Season 4.

"If you think you know what's coming next you don't know us," the trailer teases.

Luckily, fans only have to wait a few weeks to see what's to come in the new season as "This Is Us" returns Tuesday, September 24 at 9 p.m. ET on NBC.

Watch the full trailer, above.

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