As Welles had made an agreement with producer Louis Dolivet in 1953 to work exclusively for him (beginning with their troubled film production Mr. Arkadin), Dolivet was brought on board as the series producer.
Among Ruiz del Río's achievements was to consistently work with a number of higher profile directors, including with Stanley Kubrick on Spartacus (1960), George Cukor on Travels with My Aunt (1970), Orson Welles on Mr. Arkadin (1955), and Guillermo del Toro on Pan's Labyrinth (El Laberinto del Fauno) (2006).
He has recorded a commentary track with fellow film critic Jonathan Rosenbaum for the Criterion Collection release of Orson Welles's "Mr. Arkadin" (1955) and for the Universal 50th anniversary DVD of "Touch of Evil" (1958).
The episode "Man of Mystery", written by Welles, was later expanded by him and served as the basic plot for his film Mr. Arkadin.
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In addition, recordings of the 1952 episodes Man of Mystery, Murder on the Riviera and Blackmail is a Nasty Word are included on the Criterion Collection DVD The Complete Mr. Arkadin.
In the final scene of Orson Welles's 1955 film Mr. Arkadin, a pair of Pegaso Z-403 coaches appear prominently close to an aircraft in an aeroport (actually, Madrid Barajas airport, the coaches belonging to Iberia airlines).
After the release of Mr. Arkadin in 1955, she was stung by the wave of negative reviews of her performance (in which her voice had been dubbed by Billie Whitelaw, to conceal her strong Italian accent), and once she was married to Welles, she acted in only a handful of her husband's projects, and then withdrew from acting altogether.