The Puffin eshorts were a series of short stories released digitally by Puffin Books to celebrate the 50th anniversary of Doctor Who. One story was released on the 23rd of each month of 2013, each featuring a different incarnation of the Doctor.
The series began in January with a First Doctor story and proceeded chronologically through the Doctors until it culminated with an Eleventh Doctor story in November. A short story featuring the Twelfth Doctor, Lights Out, was released on 23 October 2014. Later, on 7 March 2019, Thirteen Doctors, 13 Stories was released, containing a new short story featuring the Thirteenth Doctor, Time Lapse.