The Doctor and Ruby arrive at UNIT HQ to ask about the mysterious woman - Susan Twist - following them around the universe. UNIT, meanwhile, has been monitoring someone named Susan Triad, a British tech billionaire who will announce her gift to humanity later that day.
Even the goofballs at UNIT work out that S.TRIAD is an anagram of TARDIS and the Doctor thinks Triad, or the mysterious woman more generally, could be his granddaughter.
The Doctor then meets Triad just before she gets on stage, prompting her to remember all of her other selves. Whenever Triad dreams, she's somehow aware of those myriad alternate selves.
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