Jesse Gordon Spencer (born 12 February, 1979) is an Australian actor and musician. He is known for his roles as Billy Kennedy on the Australian soap opera Neighbours (1994–2000), for which he was nominated for two Logie Awards, Dr. Robert Chase on the American medical drama House (2004–2012) and Captain Matthew Casey on the American drama Chicago Fire (2012–2023).
On a space mission, Jean Grey awakens something dormant within herself. Upon returning, she demonstrates unimaginable powers and increasing instability, revealing the cosmic force known as the Phoenix, an entity linked to creation and destruction.