Katie Cassidy & Caity Lotz: Sisters Reunite on 'Arrow'!

Katie Cassidy and Caity Lotz have a sister’s night in this new still from Arrow.

In tonight’s all-new episode “Heir to the Demon,” as Laurel (Cassidy) continues to unravel, Oliver (Stephen Amell) and Lance (Paul Blackthorne) try to convince Sara (Lotz) to stay in Starling City and finally reunite with Laurel and Dinah (Alex Kingston).

However, Sara’s fellow League of Assassins member, Nyssa (Katrina Law), comes to bring Sara back to the fold, but when Sara refuses, Nyssa kidnaps Dinah. Realizing she’s putting her family in danger by staying in town, Sara considers re-joining the league.

“Heir to the Demon” airs TONIGHT @ 8PM ET/PT on The CW. 10+ pics inside…