The Doctor
From Jenny Everywhere Wiki
Jenny Everywhere once noted that "some people" got into even more trouble than she did. For proof, she pointed to the Doctor’s TARDIS which, with supreme bad luck, was materialising in the middle of the very firing squad Jenny had just escaped in one universe. (COMIC: The Late Shift)
Behind the scenes
The Doctor, or "Dr. Who", whose unnamed cameo in The Late Shift was an unlicensed easter egg, is the main protagonist of the Doctor Who series, which was debuted in 1963 and spans a variety of media.
The character was cited in 2002 as an inspiration for Jenny in one of the original Barbelith forum-threads where Jenny was created.