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In the Young Pioneer camp the director is afraid of harmful accidents with children and his subsequent responsibility for them. Accidents in his view appear, when formal rules are violated. Hence, he believes, that all should be done according to formal instructions and regulations. One boy named Kostya Inochkin (Viktor Kosykh) trespasses the rules, swimming to island. He is expelled from camp, but fearing to bring sorrow to his grandmother, returns to camp illegally. Soon other kids start helping him to stay, being more smart than adults. Adults are added to the plot later and also oppose to director's formalism. Finally the director is removed and expelled to town.

How to Watch Welcome or No Trespassing Legally and Safely

If you want to stream Welcome or No Trespassing through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Welcome or No Trespassing films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.