Caitlin Harris

Alan and Lyndsey introduce their mothers; Jake and Eldridge get a ride from Walden to a party.

The ER is quarantined when a viral outbreak jeopardizes the lives of the doctors and patients at Angels Memorial. Also, Ariel (Emily Alyn Lind), the young girl Leanne bonded with a year ago when she lost her father, returns to Angels.

The doctors work with the Center for Disease Control and Prevention to find an antidote to the deadly viral outbreak at Angels Memorial. Also, Leanne makes a life-changing decision, and Jesse welcomes a new batch of residents.

A downtown gas explosion sends dozens of casualties to the hospital. TC, Drew and Gwen scramble to the chaotic scene as Topher leads the team at the hospital. Meanwhile, Paul delves into his first night in surgery rotation while dealing with the unexpected arrival of his neurosurgeon father.

To make Cooper jealous, Kelly agrees to go out on a date with one of Josh’s clients. But Cooper retaliates by taking out a younger girl. Meanwhile, Neal and Barry end up dating a polyamorous girl – together.