Chang Lee was a young Asian-American gangster in San Francisco in the year 1999.

On 30 December 1999, Lee and his friends were beset by several members of a rival gang. The gang members shot Lee's friends one by one. Just when it appeared that Lee would follow his friends into death, the TARDIS appeared in front of Lee and the Seventh Doctor emerged. Confused, the rival gang members fired on the Doctor, then fled. Lee got an ambulance to take the Doctor to a hospital, giving the false name John Smith as the Doctor's identity. After the Doctor "died", prior to regenerating into his next incarnation, Lee was told of the unfortunate news by Dr Grace Holloway. He seemed mildly upset, but was more interested in feigning a relationship with the Doctor so that he could steal his belongings. As Grace became suspicious of Lee, he ran off with the bag containing the Doctor's sonic screwdriver, TARDIS key, and other items.

_{Biography from the TARDIS Data Core article, licensed under CC-BY-SA}