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This Is Us fans were so confused by the season four premiere because we were introduced to so many new characters… so who are they?!

For the first hour of the 68 minute episode, the only familiar faces we saw were Mandy Moore‘s Rebecca and Milo Ventimiglia‘s Jack. The rest of the cast was completely new to us.

There are already lots of fan theories about who the new characters are and we’ll probably slowly find out more details throughout the season.

For now, we do know some details about all of the characters and the actors who play them. There definitely are a lot of secrets left to uncover in the meantime.

Click through the slideshow to meet the new actors and characters…

The fourth season of This Is Us is premiering in a few weeks and NBC just released a new trailer, which reveals a lot of new cast members!

One of the most surprising cast additions is writer and director M. Night Shyamalan, who can be seen in a brief moment in the trailer.

We already knew that Once Upon a Time‘s Jennifer Morrison is joining the show in a major recurring role and we have our first glimpse at her in character.

When They See Us‘ Emmy-nominated actor Asante Blackk is among the new stars and Deadline surmises that new cast members Marsha Stephanie Blake and Omar Epps will play his parents.

Other new stars include Animal Kingdom‘s Bahara Golestani, Psych‘s Timothy Omundson, Queen of the South‘s Julian Silva, Doubt‘s Auden Thornton, and Revenge‘s Nick Wechsler.

In the trailer, Mandy Moore‘s Rebecca is seen telling Milo Ventimiglia‘s Jack, “It’s actually kind of terrifying how a single cross with one person who you’ve never met can change everything.”

The fourth season of This Is Us premieres on September 24 with an extended episode.