The Twelfth Doctor helped Evie with an assignment to have an imaginary interview with Winston Churchill. According to Clara Oswald, the Doctor "basically cheated", as he took Evie to meet him. The Doctor suggested that Evie should have emphasised the term "imaginary".
Receiving an A on her assignment, Evie took a selfie with Clara as thank you present for the Doctor. When Clara showed the selfie to the Doctor on her iPhone, the Doctor glimpsed Ashildr in the background. (TV: The Woman Who Lived)