After detecting an odd warp in space-time within another universe, the Space Science and Technology Bureau on the Land of Light(Nebula M78) takes their discovery to the Inter Galactic Defense Force Headquarters, asking them to go check it out.
Little do they know that they have discovered the Straight Road, the path to Valinor!
Needless to say the Ultras don't need to take the Straight Road; using a Travel Sphere the older, wiser Ultra Brothers just smash through the dimensional barrier of the universe and announce themselves, "we are explorers from another universe, and we come in peace! Other people call us the Ultra race, and we are committed to peace, and justice. Also we are professional kaiju exterminators, so please call us if you have a giant monster problem...its a free service we provide."
After the initial introductions both sides sit down to talk, and hopefully knock out a peace and non-aggression agreement between the Valar and the Ultras.
How do things turn out?