The Mushroom Kingdom under attack, Mario must stop Bowser's new weapon, known as "Z-Star"! Meanwhile Mario found the pieces fragment of the Time Star he decide change Sonic's and Amy's past but first find his brother and friends hope are they okay.
But Mario being forced to fight and kill his friends because Bowser is using an evil star to control them. Toad, Luigi, Peach. It just makes it all the more satisfying
when Time Star help Mario defeat Bowser then change their past Mario must hurry before Bowser with his weapon Z-Star just in time Mario and Time Star made it on Airship back in time and kill the Z Star and Bowser.
Mario and Time Star goes Sonic's World To kill Eggman and Sage and ships Sonic and Amy back in time.
In the 1993 Time Star give Chosen Love Name Mario disguise as Fortune Teller shows Sonic about a misunderstanding what he made worst future. Sonic was upset about ruined Amy's life but Sonic has makes things right to fix his mistakes and changed the future, Fortune Teller told he and Amy are Chosen Love He told Love Rules No fight for each other. No to argue. No leave from each other. No away from each other. No making jealous. No bullying each other. No mad at each other. No hurt each other. No Ignore each other. No cheating on each other and No blame each other. Sonic Promise never away from her. Fortune Teller give a Chosen Love Name to Sonic,
Mephiles arrived Mario confront him and to reach his full power, destroying Mephiles once and for all,
Mario and Time Star saw Sonic and Amy first met, after explain Sonic and Amy going together to defeat Dr. Robotnik, Mario was happy, but Time Star ask "What about Metal Sonic?" and Mario destroy Metal Sonic,
Mario goes back to Mushroom Kingdom and Time Star goes back his dimension.
Mario goes back to Mushroom Kingdom and Time Star goes back his dimension. In the Secret Ending Mario and Time Star saw Sonic and Amy kiss, It makes Mario tears.