What if most of the Big Bads of Seasons 5, 6, and 7 were all combined in Season 5?
It would go like this: the Trio is working for Glory who promises them fame, glory, and girls if they do certain favors for her like research for her to use for her plans. Glory is being manipulated by the First Evil into opening the gateway back into her dimension knowing the destruction it would cause in its wake. The First Evil was awoken after the Master’s death. The Master being stuck underground somehow kept the First Evil from awakening. But when the First tried to step foot outside of Sunnydale, something kept it from leaving town and that is its connection to the Hellmouth. As long as the Hellmouth exist, the First can’t free to live life outside of Sunnydale. So for years, the First has been plotting for a way to secure its freedom which eventually came in the form of Glory.
It would go like this: the Trio is working for Glory who promises them fame, glory, and girls if they do certain favors for her like research for her to use for her plans. Glory is being manipulated by the First Evil into opening the gateway back into her dimension knowing the destruction it would cause in its wake. The First Evil was awoken after the Master’s death. The Master being stuck underground somehow kept the First Evil from awakening. But when the First tried to step foot outside of Sunnydale, something kept it from leaving town and that is its connection to the Hellmouth. As long as the Hellmouth exist, the First can’t free to live life outside of Sunnydale. So for years, the First has been plotting for a way to secure its freedom which eventually came in the form of Glory.