Omega (The Evil of the Daleks)
From Tardis Wiki, the free Doctor Who reference
That is my name. the Doctor gave it to me. Yes. He is my friend!
Omega was a genetically altered Dalek, created by the Doctor. He isolated the Human Factor from Jamie McCrimmon and implanted it in three Daleks.
If he had not done this the Daleks would have destroyed the TARDIS. (DW: The Evil of the Daleks)
