Part 5/9:
Swarm, intriguingly, is portrayed as the offspring — or progeny — of the Doctor herself. This concept is utterly jarring, suggesting a familial link that redefines the Doctor’s identity as part of the villain’s lineage.
The climax involves the Doctor traveling to "Ancient Gallifrey" to divert the flux— a cosmic catastrophe—by teaming up with Ruth, a character from the 2005 revival, and using regeneration energy to counteract the chaos.
The Rise of Unbelievable Mythology
Perhaps the most shocking development is the introduction of what can only be described as mythic overhaul: