Name
  
  
Alter Ego
Dr. Nathaniel Essex
  
Hartley Robert Rathaway
  
Alias
Mister Sinister, Dr. Nathaniel Essex, Nathan Milbury, Michael Milbury, Arnold Bocklin
  
Hartley Rathaway The Piper
  
Who Played
  
  
In Films
Not Yet Appeared
  
Not Yet Appeared
  
Family
  
  
Love Interest
No Love Interest
  
No Love Interest
  
Genre
  
  
Identity
Secret
  
Secret Identity
  
Alignment
Supervillain
  
Superhero