In comments

Team Sonic does their thing at the start of the movie to set the scene and show how the bonds of the team have grown

Shadow causes destruction

Sonic team tries to stop him, fails miserably

Team up with Robotnik cuz they need his help

Character development stuff as the team follows shadows wake of chaos

They fight Shadow for a final time, beat him, and convince him to become a good guy

Everyone is happy

Robotnik betrayal, reveals Metal Sonic

Metal beats up Shadow

Sonic has to fight Metal, resulting in a battle where Sonic loses due to cockiness

Sonic and Shadow have to team up to try and beat Robotnik and Metal

Big battle against Metal, Metal loses

Robotnik teams up with his grandfather (I forgor his canon name) and then unveil the orbital laser thingy from Sonic adventure

Out comes the creature thing also from Sonic Adventure

Sonic and Shadow go super and fight it, and win due to combined power

Sonic and Shadow destroy the death ray, Shadow potentially giving up his life doing so, and probably killing Eggmans grandfather

Stuff settles down, Sonic team mourns Shadows death

Movie ends with plot twist of Shadow apparently being alive

Live and Learn plays in the credits

Post credit scene alluding to next film with some character reveal like maybe Amy

I disagree with the final part

Post credit scene?

Yeah

It could be anyone, it could even be a set-up for a Sonic Heroes movie:

Metal survives

Sees Robotnik left him behind

Metal Sonic could be the main villain of the next movie

i was actually thinking if this could be their final film

Nice plot ngl

F**king cease to exist

bro itssoobviou

What is

Nice theory ngl

I really hope Black Doom comes into the film as the true villian, they were so cool and is one of my second favorite villians in the entire sonic franschise

...
Who dat?

Im tweaking, HOW DA FACK DO YOU NOT KNOW WHO HE IS-

Ah I see now

Looked him up

I know him

Hes basically kinda the reason Shadow even existed

Kind of like the idea of introducing a surprise character although I think Rouge would be an equally good option because of her ties with Shadow

She feels a little far fetched for the actual movies
I think Metal would be more important to the plot