Dan Lewis's TARDIS key

Dan Lewis held possession of a TARDIS key.

History
When cut off from the Thirteenth Doctor and Yasmin Khan while escaping from a swarm of giant wasps in the Gardens of Everlasting Summer, Dan was able to quickly escape back to the Doctor's TARDIS with Stripe in his arms by using his TARDIS key. However, he forgot to lock the doors behind him and was partially caught in a time storm as a result. (COMIC: The Everlasting Summer)