By finding a rare Action Kamen card, Shinnosuke Nohara and his family end up being chosen to go to a parallel world and help foil an alien invasion that is occurring over there. 
(Source: Anime News Network)

A band of criminals want to get the treasure of the famous Treasure Island, but the key of the treasure chamber is guarded by a little kid. Then, they come to Japan and kidnap Shinosuke Nohara by mistake, who looks exactly like the little kid who has the key.

Crayon Shin-chan follows the wacky antics and adventures of five-year-old Shinnosuke "Shin" Nohara and his parents, neighbors, and friends and is set in Kasukabe, Saitama Prefecture, Japan. 
Many of the jokes in the series stem from Shin-chan's occasionally weird, unnatural and inappropriate use of language, as well as from his inappropriate behavior. A typical gag involves Shin-chan confounding his parents by using the wrong phrase for the occasion; for example, saying "Welcome back!" instead of "I am back!" when he comes home. 
During the beginning of the series, the TV show was mostly based on the storyline in the original manga. As the show progressed, more and more episodes became anime-original.

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