Hollis's other film work included minor roles in Captain Kronos – Vampire Hunter for Hammer Films and Gene Wilder's The Adventure of Sherlock Holmes' Smarter Brother. In television, Hollis took the role of Sondergaard in the Jon Pertwee era of Doctor Who in the story The Mutants, and appeared in The Avengers episode The Cybernauts as a sensei, and in The Superlative Seven as Magwitch. He was also in The Tomorrow People. He also appeared as "Kaufmann" with a young Julie Christie in the BBC classic 'lost series' A for Andromeda.
