Supreme One is a minor antagonist in the Doctor Who episodes The Stolen Earth / Journey's End.
The Supreme One is a Supreme Dalek was in charge of the invasion. He declared victory in capturing Earth and reported to his (at the time) unseen creator who was only interested in capturing The Doctor.
While he kept looking out for The Doctor, he sent out a group of Daleks to kill Harriet Jones. Then when the Doctor arrived, he sent out Daleks to find him and exterminate Torchwood. The Doctor, Rose Tyler, Donna Noble and Jack Harkness (all being aboard the TARDIS) teleported to the Crucible where they were confronted by the Supreme One. As they leave the TARDIS on his orders, The Supreme One orders the TARDIS to be destroyed while Donna was still onboard (the doors closed and locked her in which was the doing of Dalek Caan), declaring it to be a weapon and ignores The Doctor's pleas to bring her back. Jack Harkness attempts to shot the Supreme One, but it does no damage and he exterminates him, not knowing of his immortality. Rose and The Doctor are then sent down to the Vault where the Supreme Dalek declares that they are now the "play things" of Davros.
Davros despite being the creator of these Daleks, reveals that he isn't in charge but has an arrangement with them which is to ensure their victory on dominating the universe just as long as he is allowed to live. But to ensure in co-operation, the Supreme One locks him and Caan in The Vault.
After a period of time, The Supreme One begins the activation of the Crucible. As he watches the transmission of The Doctor and The Children of Time, he descends to The Vault thinking that Davros betrayed the Daleks and orders everyone in the room to be exterminated. Dalek Caan is revealed as the traitor and the Supreme One shoots the machine The Meta-Crisis Doctor was using to save the world, destroying it. Jack Harkness makes a second attempt to kill him and succeeds by blasting him with his Defabricator saying "Fill This".
- The Supreme One has been able to express some emotions unusual for a Dalek such as:
- Pride at the success of capturing Earth.
- Fear of his creator Davros.
- And humor when calling The Doctor and Rose play things.
- Interestingly, he is also highly racist and prejudiced, which is also unusual for a Dalek which is shown when he uses the Vault for non-Dalek beings because of a fear that the beings may be contaminated (Dalek Caan being the exception due to having lost his sanity).