What Dandello said. The main point of plagiarism is to pass off someone else's work as your own and take credit for their hard work.
With material gleaned from LNC episodes, if you post it here there's not much chance of that as most readers will recognise the source. Even so, many authors put in an author's note crediting the source and original writers, just to be polite. But there's no problem with using LNC material.
So long as you give due credit as to your source, make it clear you're using another person's material and don't try to pass it off as your own work, there's no real problem with using material from another show either. That goes, incidentally, for any source material other than your own - be it from TV, movies, books...whatever. Always credit and you should stay out of trouble.
LabRat
