The Hybrid

The Hybrid was a legendary creature thought to be crossbred from two warrior races, according to prophecies from the Matrix. The two races assumed to make up the Hybrid were the Daleks and the Time Lords. (TV: Hell Bent)

References

Davros attempted to transform some of his Daleks into Time Lord hybrids, intending to fulfil an ancient Gallifreyan prophecy which warned of a Dalek-Time Lord Hybrid that would conquer Gallifrey. (TV: The Witch's Familiar) However, the Twelfth Doctor later claimed the Daleks would never allow anything to be "half Dalek" and that the hybrid of Time Lord prophecy was "Me". (TV: Heaven Sent) He later shared this theory with Ashildr, at which point she countered with the theory that either he singly was the Hybrid. Alternatively, she suggested that if the Hybrid could be interpreted as being more than one being, then the Hybrid could refer to the pair of the Doctor and his companion Clara Oswald. Another theory was that the hybrid might be the Doctor and the Master's relationship. (TV: Hell Bent, Face the Raven)