Controlled by a pair of alien duck siblings, Muriel attempts to break into a military compound to rescue the ducks' third brother. Having freed her from their grasp, Courage confronts the aliens and offers them another solution. A locked box left behind by Eustace's late brother, Horst, defies Eustace's every attempt to open it. Through Shirley the Medium, a Gypsy chihuahua, Eustace contacts his brother for the key, despite Horst's warnings. As the cursed box releases a grabby terror, Courage pleads with the medium for assistance.