Caitlin Harris

Alan and Lyndsey introduce their mothers (Holland Taylor and Georgia Engel) to one another, so that they can have more time together. Meanwhile, Jake and Eldridge enlist Walden to drive them to a high school house party that they never find.

The ER is quarantined when a viral outbreak jeopardises the lives of the doctors and patients; a young girl whom Leanne bonded with a year ago when she lost her father returns to Angels Memorial.

The Angel's Memorial team try to find an antidote for the viral outbreak, Leanne makes a life-changing decision, and Jesse welcomes a new batch of residents.

A downtown gas explosion sends dozens of casualties to San Antonio Memorial Hospital; TC, Drew and Gwen race to the explosion site, where they receive help from a former army medic; Paul gets through his first night in surgery rotation.

Cooper and Kelly pretend to enjoy dating other people in an attempt to make each other jealous, while Neal and Barry date a polyamorous woman.