Mwahahaha!

In Mwahahaha!, each player takes the role of a diabolical mastermind bent on world domination.  The description in the game itself puts it rather nicely, I think:

Mwahahaha! is a card game of mad scientists and global domination for 2 to 5 players. You assume the role of an evil genius who builds a criminal empire and constructs a doomsday device with which to cow a trembling humanity. But you’re not the only one with grand machinations. Other players rival you for absolute mastery. He who completes his device first and collects the highest ransom is declared the winner — and ruler of the world!