Not The Original Time Travelers (NOTTs) are time travelers who have been given temporary access to the ETM by the Original Time Travelers. There are much more NOTTs than OTTs, with an estimated number of currently active NOTTs being at around 780, compared to only 30 active OTTs.

NOTTs have been instrumental in the advancement of temporal research work throughout the 20th and 21st centuries, specifically in discovering and documenting Timeline Anomalies.