"Battery Replacement" is the nineteenth chapter of the Story Mode in Mario & Sonic at the Olympic Games Tokyo 2020.

PlotEdit

Tails and Luigi return to the Olympic Stadium, where Eggman Nega and Bowser Jr. are waiting with the Tokyo '64. With the battery almost dead, Tails and Luigi have to switch the batteries instantly, or else they will fail. Meanwhile, inside the game, Bowser feels something wrong with his body, with his speech also being affected, and when Dr. Eggman tries to run, he barely moves. He, Mario, Sonic, Toad, and Bowser all attempt to run in order to try to reach the light, but to barely any avail. The environment around fades away and becomes completely black. As they continue their attempt to reach the light, Tails pulls out the old battery from the system while Luigi puts in the new one. In the game world, Toad becomes the first one to fade away into nothing but a singular pixel. He is then followed by Bowser, Mario, and Sonic, each of whom also becomes a singular pixel before Dr. Eggman joins them as well. The five lone pixels then all disappear, meaning they would be gone, until all five regain their forms and the environment becomes colorful again, as Tails and Luigi's operation in the real world was a success. Tails, Luigi, Eggman Nega, and Bowser Jr. then celebrate in the real world. Mario, Sonic, Toad, Bowser, and Dr. Eggman all stand inside the beam of light. Luigi, Tails, Bowser Jr., and Eggman Nega watch from outside the console as five colorful figures exit the system, revealing themselves to be the trapped characters, who have returned to reality.