Who's That Girl! was the Doctor Who back-up strip which appeared in the pages of The Incredible Hulk Presents #8-9. Like all in the series, it was monochromatic and featured the Seventh Doctor travelling alone at the beginning and ending of the story.
Aside from a few Second Doctor stories that were set in Season 6b, this story was unusual for being one of the only stories in any medium to depict the Doctor as voluntarily being an agent of the Time Lords. Here he's effectively the Time Lords' representative at a political conference.
An intergalactic treaty is about to be signed which will give the Frovians free access to the Kollian Dimension. The Doctor arrives in support of one of the signatories, the Frovian Prince Luj. But why is the Doctor now a woman? And just how much can the Doctor trust his royal friend?
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- Luj claims to have known at least two of the Doctor's past selves, but it's not clear if that includes the Seventh Doctor.
- Kasgi's impersonation of the Doctor includes her dressing the part. She uses the Third Doctor's frilly shirt, the Fourth Doctor's scarf, the Fifth Doctor's coat, the Sixth Doctor's trousers and the Seventh Doctor's pullover.
- To get out of the magnetic clamps which Kasgi used to bind him to the TARDIS console, the Doctor "reverses the polarity" of the electromagnet in the central column.
- This story contained a gag later used in the parody The Curse of Fatal Death. It's briefly suggested that the Doctor's apparent change of gender could lead to romantic relationships not possible had the Doctor remained male.
- It's never made clear exactly how Kasgi caught the Seventh Doctor and strapped him to the TARDIS console. He is simply shown as bound at the cliffhanger of part one.
- This story posits the notion that "aligning the timelines will speed up travel for several races", but it's unclear what, if anything, this means, as such a thing hasn't been proposed in other Doctor Who fiction.
- The Doctor "reverses the polarity" of the electromagnet in the central column of the TARDIS. This phrase originated with the Third Doctor, and has been used with minor variations by many incarnations since. This is one of the few times the Seventh Doctor utters it in any medium.
- Who's That Girl! takes place after IHP: The Sentinel
- Who's That Girl! takes place before IHP: The Enlightenment of Ly-Chee the Wise