McPhearson Phantom - Season 2,Episode 11

Muriel gets blamed whenever she gives Eustace or helps Eustace, because something weird happens after she does so. Courage can't figure out what it is. Eustace blames Muriel for trying to get rid of him. Muriel is innocent and is doing nothing. Eustace calls his mother to work out this problem, but she is actually part of this problem. While Courage tries to get Muriel and Eustace on friendly grounds, Eustace's mother bumps into a spirit, who tells her that she is trying to break up Muriel and Eustace's marriage because one of Muriel's past relative's broke up the spirit's marriage. Eustace's mom also wants to get rid of annoying Muriel, and the two start to plan together to get them split. But then once Eustace's mom and the spirit go upstairs to Courage, Eustace, and Muriel... there plans go wrong. Eustace's mom and the spirit fight. The spirit finds out that is wasn't Muriel's relative it was one of Eustace's mother's relatives. She goes after her and everything goes back to normal. Courage, Eustace, and Muriel are back to normal sitting in the kitchen.