For years, as loyal viewers know, Emily Thorne believe her father was dead.
She based her entire life on seeking revenge against the people responsible for his framing, most notably Victoria Grayson.
So, in many ways, the entire series has been a build up to Revenge Season 4 Episode 4, as Emily was shaken to her core by a truth viewers discovered on the season 3 finale in May:
David Clarke is alive.
What else do you even need to know? This is a must-watch installment for anyone who has ever seen the drama? Go ahead and watch Revenge online to see Emily's reaction: