Sonic x Dragon Ball

Outline

Hey there! That's the outline of Sonic x Dragon Ball, in which I will give you a premise of all sagas included. The crossover will consist of 4 sagas, shown below:

1- Collision of Worlds Saga: 

It will act as a prologue to the crossover, and it will be split into two parts: one part will be set in the Sonic universe, and the other will be set in the Dragon Ball universe. It will explain the events leading into the crossover in the Sonic and Dragon Ball universes, with Sonic and his friends trying to stop Eggman from unleashing his mysterious plan to create a bridge between the Sonic and Dragon Ball universes, and while the Z-fighters stop the resurrected Dr. Gero from doing the same. 

2- Tourament of Chaos Saga: 

Instantly after the collision of worlds, Sonic and his anthropomorphic friends are deemed a threat because of their strange origins, and several locations from the Sonic and Dragon Ball universes are discovered. Satan announces the Tourament of Chaos, an attempt to calm down the concerned citizens and get Sonic and his anthropomorphic friends in the people's good graces. In this saga, Sonic and his friends meet the Z-fighters. Sonic, Shadow, Silver, Knuckles, and Blaze enter against Goku, Vegeta, Piccolo, Gohan, and Majin Buu in a format similar to the 6th Universe Tourament Saga in Dragon Ball Super. 

3- The Hunt Saga: 

Tails and Bulma discover that the merged world is starting to destabilize, and the only way to stop that and separate the two worlds is by powering up the Gaia Temples with the Chaos Emeralds and the Master Emerald. To achieve that, the heroes divide themselves into teams. Knuckles, Piccolo, Gohan, and Majin Buu search for the Master Emerald shards, which were scattered throughout the merged world after the first saga. Silver, Blaze, Tails, Bulma, and Amy search for the depowered Chaos Emeralds. Sonic and Shadow, realizing that they need to get stronger, train with Goku, Vegeta, and Broly on Beerus's planet. Frieza gets in the way, wishing to acquire the massive power of the Chaos Emeralds and the Master Emerald. Eggman sends his ultimate creation, Perfect Egg Android, to get the Chaos Emeralds and the Master Emerald shards. Gero, who has built an upgraded version of Cell called Ultra Cell and took his body for himself,  enters the Hunt as well. Neo Metal Sonic, having went rogue, pursues this power as well. This leads to a chaotic battle for the fate of the merged world. 

4- End of The World Saga:

The collision of worlds caused a time rift in which Memphiles entered. He foresaw his destruction, and he travels into an alternate timeline, the crossover's timeline, to avoid that fate. He orchestrates a plan to render the Chaos Emeralds and the Master Emerald incapable of use, which works, and as a result, after managing to possess Frieza, he acquires their power and begins his onslaught. It's the entire universe vs an all-powerful Memphiles; will Memphiles end it all, or will the heroes find a way to save all of reality?

The crossover will take up about 100 episodes. It'll be worth it, though, cuz trust me; it's gonna be a blast! See ya!