Kreos

Kreos was the leader of the Thal Military when the First Doctor, Susan, Ian and Barbara returned to Skaro more than 50 cycles after the Thal-Dalek battle.

Biography
Kreos was positioned at one of the ionising towers on Skaro, where he met the Doctor and his compainions after they returned to the planet using the TARDIS' fast return switch. Realizing that these strangers were the travellers who had previously rallied the Thals against the Daleks, he invited them back to the Thal City to meet with Damadus, the High Leader of the Thals.

After Susan had snuck off to the Dalek City with Jyden, son of the Thal chief scientist Tryana, Kreos accompanied her, the Doctor and Ian to the city to find the children. Exploring the ruined city, the Doctor detected a source of power below the lowest level. When the group descended, Kreos and his troops became separated from the three civilians, Tryana not trusting him or any other Thal to speak to the Dalek Supreme. After performing several sweeps of the area, the Doctor's group returned with the children and two active Dalek drones whom Kreos was ordered to take to the Thal City as emissaries of peace, an order he reluctantly complied with, leaving two of his guards behind.

It was soon revealed that the Daleks had no desire for peace, attacking the Thals when the Supreme abandoned its own ruse. Working with Ian and Barbara, the Thals were able to defeat one of the drones by insulating it with Kreos' cape only to learn that the other had taken Susan as hostage.

Using a recovered Dalek casing as a disguise, Ian and Jyden rescued the Doctor and Susan while Kreos attacked the area around the main ionising tower, distracting the Daleks long enough to be destroyed by the recovered casing. With the main tower seized, the Doctor used it to reprogram the network to target the Daleks' Dalekanium casings, forcing them to retreat before Ian overloaded the power feeds to the Dalek City, destroying it.

In the aftermath, Kreos, alongside Damadus and Jyden, bade farewell to the Doctor and his companions, though none were fully convinced that this had marked the end of the Daleks. (AUDIO: Return to Skaro)