Nikola Papadoupulous

Nikola Papadoupulous was the twin brother of famous Greek biochemist Hektor Papadoupulous. Unlike his brother, he spent his childhood pick-pocketing on the streets of Athens. Later, he became an art-thief. He was once caught red handed while stealing a painting of Di-Hooch.

Hektor failed to attend an invitation sent by Alexander Krag, because he was sick. Nikola knew from somewhere that Alexander Krag was very rich and had a great collection of rare and expensive artworks, so he faked himself to be Hektor and joined Prof. Shonku and Prof. John Summerville to Krag's castle. Krag mistook him for Hektor and told the three about his apparatus to bring back life. Later in the night, Nikola broke into Krag's lab, using a liquid, which he claimed to invent all by himself. As soon as he opened the room, he got a smell which is usually found in the zoo. So he called Shonku and Summerville to help him. They discovered Krag's plan of world domination using his hypnotizing gas called Hypnogen. They witnessed the effectiveness of Hypnogen on a stunned Panther and a snake. They also discovered H-, the antidote to Hypnogen. Later Odin, Krag's robot, came to the laboratory, took the H- from them and ordered them to leave the lab. But, Nikola used his experience of pick-pocketing to take back the H- from Odin.

The next morning, when they were supposed to bring back Krag into life, Nikola was forced to reveal his true identity to Summerville and Shonku. While Summerville and Shonku were busy to operate the apparatus which was supposed to bring Krag back into life, Nikola managed to escape the room, and through the window drop the H- on the panther. The panther killed Krag who was recently brought back to life, and the confusion helped Shonku, Summerville and Nikola to escape Krag's castle.