The Flash vs Mister Sinister Real Name
Alter Ego
"Barry" Allen
Dr. Nathaniel Essex
Alias
Black Flash, Parallax
Mister Sinister, Dr. Nathaniel Essex, Nathan Milbury, Michael Milbury, Arnold Bocklin
In Films
Ezra Miller, George m. o'connor
Not Yet Appeared
Love Interest
No Love Interest
Alignment
Superhero
Supervillain