Actually, people often sue when there's very little legal basis because they know they can scare people into compliance with threats and potential legal fees. Anti-SLAPP laws are often insufficient to prevent such lawsuits, and DMCA takedowns are often abused with impunity.Yeah, there are actually legally standards that must be met, you just can't sue because of this or that because so-and-so thinks it's a rip off and can be sued.
That said, FOX has lawyers and money, and I don't think The Orville is similar enough to infringe, so CBS stands little chance of actually prevailing in a legal battle. My point was that if The Orville could be successfully sued, Seaquest wouldn't be safe either.
I think the Smurfs actually predate them by a year, but it's close.That one was basically a Trolls rip-off, but I don't think the franchise can be relegated to ancient history quite yet.