Name: Monsieur Duvoir
First Appearance: My Greatest Adventure #82 (Sep. 1963): "Three Against the Earth!"
Number of Appearances: 1
Teams/Affiliations: Green-Headed League
Foe of: The Doom Patrol
Note: modelled after actor Sydney Greenstreet
Monsieur Duvoir, a prominent businessman regarded as a financial genius, was secretly an alien member of the Green-Headed League.
Suggested links for further research about this character and the character's religious affiliation: