Return of a Friend

Marco and Star. The inseparable friends are no longer friends, separated by an argument and the deaths of close ones. Marco is on Earth with Ambrosia and Star is on Mewni with Tom. But when their friend from the past Jack Frost returns an army is sent to destroy Earth and Stop Jack and Marco ever saving Star from the clutches of Tom. Can they defeat an army and save Star? or is their mission doomed to fail? (read my other book The Dark Lord first)