Watch The Grim Adventures of Billy and Mandy Season 7 Episode 14 Online with Multi Subtitles - OnionPlay

Watch Watch The Grim Adventures of Billy and Mandy Season 7 Episode 14 Online with Multi Subtitles - OnionPlay on OnionPlay - When Billy accidentally poisons Mrs. Butterbean, Principal Goodvibes offers Grim the position of substitute teacher, which Grim accepts, as now Billy and Mandy have to obey him. Grim sends the unruly students to the "Detention Dimension," an eternal punishment place in the classroom, until only Mandy remains in his class. Grim tricks Mandy into opening a portal, and she is pulled into the dimension as well. Mandy proves to be scarier than Mrs. Slither, the gigantic rattlesnake-like creature that rules the Detention Dimension, so Mandy escapes from that place and gets her revenge on Grim by sending him there too.