Kul Teska was a Skakoan mercenary during the Clone Wars, who was hired by the Sith Lord Count Dooku in order to destroy Naboo's sun. Although these claims were theorical, Obi-Wan Kenobi was going to meet with Senator Padmé Amidala when he arrived at the space station, Juma-9. There, he met Plo Koon and the two felt a dark presence. After destroying a portion of the invading droids, Kenobi ordered Cody and the crew to evacuate. Kenobi and Koon reached the bridge to find Teska talking to Dooku, but Teska shut the transmission and escaped with the Jedi following.
They met in a room and Teska used every weapon he had against the Jedi, but the two deflected the shots. They finally sent Teska flying into outer space and sealed the windows, but the two lost their lightsabers. Teska could breath in space, and then headed to the planet Ryloth, knowing the Gravitic Core to accomplish the mission was there. As he arrived on Ryloth, he discovered Cad Bane, his competitor, carrying his hi-tech weapon that can destroy an entire cruiser, just behind Anakin Skywalker and Ahsoka Tano, which is about to arrest Bane. Teska tries to grab the weapon but Anakin quickly pull the weapon with his force pull and then he flee onto the space. Anakin met him again at the Separatist's Laser factory which Teska about to launch a deadly cannon to destroy billions and finally Teska meet his fate when he stuck at the core of the laser which about to blast off. Right before the laser launch, Padmé Amidala has disabled it. And since then, Teska never seen again.