Super Smash Brothers Ultimate - Avenge the Fallen

It took me a minute to realize the blobs in the background are the future characters, for some reason my initial thought was "What are the Hell Valley Sky Trees doing here?"

Well, how would you feel if you are the only one to survive from a traumatic event that turned your friends into slaves, and the only ones who can help you are complete strangers from different worlds in the same position as you?