Owing to a professional commitment to score for the film "Hot Millions" (starring Peter Ustinov and Maggie Smith), Johnson requested assistance from his keyboard player, Howard Blake, who scored some of the episodes of the final season, as well as additional music for other episodes which Johnson did not have time to complete. These were composed in a style remarkably similar to Johnson's. In 2011, to mark the 50th anniversary of the series, these almost-complete scores by Blake−including Johnson's themes for the main and end titles—were issued on a double CD set. Of the original Johnson theme, countless cover versions have been released on vinyl and CD, and the opening motif was retained on the series "The New Avengers".