The simple answer is, of course, that using an established brand is always copyright infringement, and thus illegal. That being said, there are some ways to work around this but it's always a bit of a "grey zone".
"Fair use" allows you to refer an existing brand. Freeware games *tend* to be overlooked because no money is earned by the infringement. Using original art instead of plain rips is helpful too (because now at least you're not stealing artwork).
Sometimes a copyright has expired too- in that case nobody could sue you because nobody OWNS the brand.
Bottom line:
It's pretty much always at least partly illegal.
It's also often simply not WORTH the effort to shoot you down for a FREEWARE game.
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edit:
A, tandem post with mOds. I used more paragraphs, though
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edit:
What show, by the way? is it Ulysees 31 OR Captain Future? Or probably MASK?
"Fair use" allows you to refer an existing brand. Freeware games *tend* to be overlooked because no money is earned by the infringement. Using original art instead of plain rips is helpful too (because now at least you're not stealing artwork).
Sometimes a copyright has expired too- in that case nobody could sue you because nobody OWNS the brand.
Bottom line:
It's pretty much always at least partly illegal.
It's also often simply not WORTH the effort to shoot you down for a FREEWARE game.

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edit:
A, tandem post with mOds. I used more paragraphs, though

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edit:
What show, by the way? is it Ulysees 31 OR Captain Future? Or probably MASK?