With this episode, Peter Howell's rendition of the Doctor Who theme was exchanged for a mysterious and surreal arrangement of the theme tune composed by Dominic Glynn. It would remain in use solely for season 23 and close out Colin Baker's era on the series. Notably, Nicola Bryant's character Peri Brown starts wearing more conservative clothing from here out, after spending most of her appearances in loose-fitting and often revealing outfits. Her wardrobe change was a result of complaints that her provocative clothes were inappropriate for younger Doctor Who viewers.