Princess Peach unexpectedly arrives at the reunion by helicopter, putting a dark cloud over Mario's day. But a run-in with his old flame Samus heats things up.
Mario confronts his daughter about her hanging out with Bowser, and we get a glimpse into the dysfunctional, daydrinking home life of Link and Zelda. Meanwhile, a glittered-out Mega Man arrives to a mob of crazy teenage fans.
Princess Peach and Bowser openly flaunts her relationship with Bowser at the pool, but Mega Man has bigger problems - Solid Snake is trying to kill him.
It's the night before the Reunion and the tension is palpable between Samus and Peach. As the archenemies from childhood square off at the bar, elsewhere, Mario is forced to confront Bowser about being a bad influence on his daughter, Lil'P.
Mario bails Peach out of jail, only to discover she has no idea where Lil'P is. Meanwhile, Luigi and Justin Bailey's attempt to dispose of their little problem runs into a snag.
The day has finally arrived - our heroes don their classic costumes for the first time in years... and old memories begin to bubble back to the surface. There's no turning back now.