The Curse of Fanfic! (anthology)

The Curse of Fanfic! was a charity anthology published by Obverse Books in aid of Parkinson's UK. The anthology had a theme of unofficial crossovers between franchises, and it wasn't exclusively focused on Doctor Who/Iris Wildthyme. The anthology was edited by Paul Castle, with contributions from Paul Magrs, Kara Dennison, Simon Bucher-Jones, John Peel, Iain McLaughlin, John Dorney, Jon Arnold, and more.

Publisher's summary
Have you ever made up your own little stories based on your favourite telly shows, or wondered what would happen if two or more of your most loved characters came together in one mash-up of an adventure?

Between these covers, you'll find such disparate unexpected bedfellows as Basil Brush and Larry Grayson, Steve Zodiac and the Alien Alien Facehuggers, Doomwatch and Tomorrow's World, Inspector Gadget and the Cybermen, and many, many more.