EW is reporting iZombie alum Matthew MacCaull is joining the cast of DC’s Legends of Tomorrow. MacCaull will be taking on the role of Henry Heywood, Sr. (Commander Steel.) Commander Steel is a member of the Justice Society of America. He joins Obsidian, Vixen, Stargirl, and Dr. Mid-Nite. The series returns Thursday, Oct. 13 at 8 p.m. ET on The CW.