Matt Ryan is switching characters on DC's Legends of Tomorrow

Deadline

Ryan, who has played John Constantine since Season 3, will wrap up his arc as the DC antihero and take on a new character: Dr. Gwyn Davies, an eccentric scientist from the early 20th century who might be the team’s only hope next season. The CW series also announced that series regular voiceover cast member Amy Louise Pemberton, who has voiced Waverider’s AI Gideon, will appear in the flesh, also a series regular.