According to E Online, the duo will be starring as the young Walkers in a two-part flashback episode arc.
While Joe and Kay will play Tommy (Balthazar Getty) and Kitty (Calista Flockhart), newcomers Anna Wood will play Sarah (Rachel Griffiths), and Kasey Campbell will play Kevin.
Now that we see all the pics together, those four could be siblings. What do you think?
Pics below are of Kay at the Riverdance Farewell Performances of the Boyne Company at the Pantages Theater in Hollywood earlier this month.