User blog:TheAmazingRaspberry/Plagiarism Problem: How do we fix it?

There's a major problem on this wiki. That problem is that many of the articles are partly or fully plagarised from other sources. A lot of them are articles related to Mario, and I'm willing to bet there's at least a thousand of them. Many of them are plagarized from the Mario Wiki. But it's not just Mario articles. I've also noticed that articles like Captain Brittany, Mr. You, and The Wonderful 101 are also plagarized (Brittany from Pikipedia, Mr. You from a small retro Nintendo wiki, and TW101 from Wikipedia). So how do we fix this?