Iris Wildthyme and the Land of Wonder

In 2009, Iris Wildthyme: The Land of Wonder was released by Big Finish Productions.

Cover blurb
Exiled to Earth by her mysterious superiors, Iris has been amusing herself and Panda by working for MIAOW, the Ministry for Incursions and Other Wonders. When a certain Professor Ramsbottom and his lovely assistant Audrey unearth a weird vehicle under a London railway station, Ms Wildthyme and her art critic chum are on the scene pretty sharpish.

Among anachronistic skulls and crockery they discover the still-living forms of utterly perplexing, alien creatures. And, before you can say 'Jabberwocky' Iris and her friends are on a mind-boggling voyage into a groovy Wonderland deep, deep beneath the Earth's crust...