Doraemon Season 6 Episode 29 I've Got a Spare Fourth Dimensional Pocket ( Air Date 1984-07-20 ) Genre Action & Adventure, Animation, Comedy, Sci-Fi & Fantasy, Kids, Family category. Overview "Doraemon takes his 4D Pocket to dry, and assures Nobita that he has a spare 4D Pocket which he can use. When Doraemon goes out on a date with a cat, Nobita takes the original 4D Pocket.".