Claro que aqui pone que en la segunda temporada se rodaron 6 capitulos en video.
Due to budgetary constraints in its second season, the network decided to cut costs by shooting some episodes on videotape rather than film. Because videotape was a relatively primitive medium in the early 1960s, the editing of tape was next to impossible. Thus, each of the 6 episodes was "camera-cut" as in live TV, on a studio sound stage, using a total of four cameras. The requisite multicamera setup of the videotape experiment, pretty much precluded location shooting, severely limiting the potential scope of the story-lines, and so, the short-lived experiment was ultimately abandoned. The limitations of using videotape (e.g., it could not be edited as cleanly as film and its visual quality was poorer) led them to switch back to film for the rest of the series, despite the greater cost. The 6 videotaped episodes were titled: Dimensión desconocida: The Lateness of the Hour; Dimensión desconocida: Static; Dimensión desconocida: The Whole Truth; Dimensión desconocida: The Night of the Meek; Dimensión desconocida: Twenty Two; Dimensión desconocida: Long Distance Call and then transferred to film for broadcast, which saved the producers about $5,000 per episode.
http://www.imdb.com/title/tt0052520/trivia