Also, regardless of trademark registration, its legally only trademark infringement if it is likely to cause confusion, deception, or mistake about the source of the goods and/or services.
I doubt anyone is going to confuse a fictional time-ship (or related paraphernalia) with a SaaS providing crypto pricing (or whatever it is they do), or believe that they are made by the same organization.
But I suppose people do litigate this stuff (or threaten to...), regardless of the spirit and letter of the law.