In addition during the 1980s, he provided covers for many of the early Reeltime Pictures Myth Makers VHS interview tapes of Doctor Who stars. Clark was the cover artist for the Target novelisations of The Rescue and The Space Pirates and provided interior illustrations for the Encyclopedia of The Worlds of Doctor Who: A-D, E-K, and L-R, worked on back-projected animations shown during the stage play Doctor Who: The Ultimate Adventure, and helped out on the various interview and drama video recordings for Thirty Years in the TARDIS, as well as providing graphics for posters seen in the drama settings of the documentary.