Is is one of those episodes that was so important to the show. Not because it was major plot device but because it was an episode that, for the most part, was random yet hit every viewer right in the heart.
Why did no one remember her?
Does this episode show what humans are capable of or does this show a side of the doctor never witnessed before?
and satan said: let there be this gifset
and this is the exact moment i just kind of arched me back and put my arms up at awkward stances and screeched for a while