ROBERT KNEPPER AND ALEX KINGSTON GUEST STAR — Oliver (Stephen Amell) brings Sara (Caity Lotz) into the Arrow team. Watching Oliver and Diggle (David Ramsey) spar with Sara and talk old scars, Felicity (Emily Bett Rickards) starts to feel left out. The team is investigating a villain named William Tockman, a.k.a. The Clock King (guest star Robert Knepper), who is a brilliant thief armed with technology that can open any bank vault in Starling City. After The Clock King infiltrates the computer systems in the lair, Felicity feels pressure to prove her worth. When she gets a lead on Tockman’s whereabouts, she heads out without the team, putting her in peril. Meanwhile, Oliver throws Sara a welcome home party, but Laurel (Katie Cassidy) refuses to attend. After Lance (Paul Blackthrone) makes his case for a family dinner, Laurel acquiesces, but when Oliver shows up with Sara, she loses her temper on both of them.
When Laurel leaves the dinner table Oliver chases after her. They have a "heart felt falling out" as he tells Laurel to "stop blaming everyone else but herself for her personal problems". Oliver later returns to his secret lab to rendezvous with his teammates. Unaware of Felicity's absence the team is startled when they hear Felicity on the radio transmission saying "I'm in the same bank as the Clock King". Knowing the danger of the situation the team heads to her immediately. Arriving in the "nick of time" Oliver's team is confronted by William Tockman (the Clock King himself) and his henchmen. While Oliver and Diggle battle the more dangerous foes, Felicity and Sara are paired together. The Clock King slowly approaches them with a gun drawn. As Sara's back is turned The Clock King tries to shoot her, but at the last second Felicity spots him and pushes Sara out of the bullet's path intercepting the bullet herself. The duo eventually manages to defeat the Clock King and heads back to the lab. With Sara saying goodnight to the group and leaving for the night, Felicity admits to being jealous of him and Sara but Oliver soon raises her spirits telling Felicity "no matter what you will always be my girl". As Oliver leaves the lab he gets an "emergency text" from his house. Oliver rushes home to see that the emergency text was a setup by his sister to get him and his mother talking again but Oliver soon finds out that his mother has a surprise guest... Slade Wilson!