Okay, real talk.
We know scientist girl
has a scarf that was like The Scarf.
She clearly worked with UNIT.
She kept saying “the Doctor will save us” over and over again, but she hadn’t really interacted with the Doctor much. Sure, she must have heard things, but why would she be so dependant on someone she’s never met before?
Unless she had.
Unless her scarf was The Scarf.
Unless the Curator gave it to her, and she’s his companion.
The banana brought itself. The party ensued.