"Once Upon a Time" alum Jennifer Morrison is ing the cast of NBC's "This Is Us" in Season 4.

The actress, whose credits also include "House" and "How I Met Your Mother," will have a recurring role in multiple episodes. Details about her character have not yet been revealed.

Last month, NBC gave "This Is Us" an unprecedented announced last week, is September 24.

As for the character Morrison might be playing, fans are already speculating that it could be Kevin's baby mama (the Season 3 finale flashforward revealed he has a teen son) or Rebecca's sister.

Morrison next appears in "The Report" opposite Adam Driver and Annette Bening and directs and episode of HBO's "Euphoria."