Several longtimeGreys Anatomycast members were at the SeriesFest event in Denver, Colorado and briefly teased this seasons finale.
Interns being in trouble, Meredith doing this secret research, things come to a head, she said.
Camilla Luddingon, who plays Dr Josephine Jo Wilson, added that things really pay off in the finale.
She said it was an edge of your seat episode with cliffhangers.
Kevin McKidd, who plays Dr. Owen Hunt, called it a fiery episode.
Greys Anatomywas renewed last month for season 21.
The series is produced by ABC Signature and Shondaland.
