Myke-4 Astor
Echo
- Also known as
Echo has the power to generate sound waves. He is a member of the Legion of Super-Villains in the 31st century.
Appearances
- Adventure Comics #355 — 1967-04-00
- Superman / Batman #17 — 2005-03-00
- Superman / Batman #18 — 2005-04-06
- Absolute Superman / Batman #2 — 2014-07-00
- Superman / Batman Omnibus #1 — 2020-07-00