Lubek

Lubek is the main antagonist of the flash cartoon Princess Natasha and the former King of Zoravia. He wants to reclaim the throne by force.

Biography
Before becoming the King of Zoravia, Lubek headed the Zoravian Secret Service and Zoravia's Police Force. His actions under these positions made him so hated by his subjects that, when he inherited the throne from his father, they made a referendum and voted to have his younger brother Carl as their King. After losing the throne, he moved to the town of Fountain Park, Illinois, where he makes plans to reclaim his throne while "disguised as an ill-mannered school Principal".

Princess Natasha
In the first episode, "From Zoravia to Zoravia", it's revealed that Fountain Park was renamed Zoravia after the Kingdom. Once King Carl learns Lubek is living there, he decides to send a spy to stop him but, because of Lubek's former headship of Zoravia's secret service, he'd recognize practically every adult spy King Carl could send and is said to have trained the best ones. King Carl reluctantly sends his daughter Natasha because Lubek, having left Zoravia before her birth, won't recognize her.

In the second episode, "The Bald and the Beautiful", Natasha spends a whole night trying (and failing) to locate Lubek. In the next morning, posing as an exchange student, starts attending the same school where Lubek works as a science teacher and the Principal.