Uvlavad Kudlak was a great military leader and was also well trained in the use of firearms. As the war against the Malakh was going badly for the Uvodni, Kudlak started to work for "the Mistress", who forced him to kidnap children from Earth in order to fight on the front lines. Kudlak also duped a human, named Mark Grantham, into helping him.
Kudlak and Grantham created a new laser-tag game named Combat 3000. Those children who managed to get through to Level 2 in the game were selected as the best, and transported to an Uvodni ship. After realising, however, that his Mistress had been lying to him, and that the war had been over for ten years, Kudlak killed the Mistress, and returned the children to their families.
Kudlak had always wanted peace, and was an honourable warrior. He saw the error of his ways and asked Sarah Jane Smith to kill him for his crimes, but she refused, and allowed Kudlak to go on his way. Kudlak decided to dedicate himself to finding the rest of the children he had kidnapped from Earth and from other planets and returning them home. (TV: Warriors of Kudlak)
In late 2010, General Kudlak was part of the army of alien slaves led by the Krulius that attacked Sarah Jane's house. Clyde levitated him using a Nadloon anti-gravity ray. After Clyde defeated several of the other aliens, Kudlak regrouped with the army and the Krulius ordered them to retreat. Sarah Jane thought that the aliens were under some kind of hypnotic control, otherwise they wouldn't be siding with the Krulius. (COMIC: Defending Bannerman Road)
Behind the scenes
Kudlak appeared along with Androvax and a Graske in the video game Monster Morpher, the three foes having seemingly made an alliance. Androvax announced that the Earth would be theirs in 12 hours and the trio proceeded to laugh sinsterly. They were interrupted by Sarah Jane, who revealed them to be Luke, Rani, and Clyde respectively, using some sort of holographic device to pose as their old enemies. Androvax would be the only one of those three foes to return, unless you count the appearance of the Groske in TV: Death of the Doctor.