In Mario Brothers Plumbing, Mario, wearing a party hat, is in the midst of carrying a large pizza with a candle on it. Approaching Luigi, who is seated at a table an blindfolded, Mario, after repeatedly telling Luigi not to peek, places the pizza down in front of him. After setting the pizza down on the table, Mario tells Luigi to remove his blindfold, which he does.
After Luigi removes his blindfold, Mario wishes him a happy birthday and tells him to blow-out the candle on his pizza and to make a wish. Blowing-out the candle on the pizza, a happy Luigi proceeds to hug Mario as a thanks for making him the pizza. After Luigi hugs him tells him how good a brother he is, Mario takes an envelope out from behind his back and gives it to Luigi, saying it is his birthday present.
Excited, Luigi grabs the envelope and begins to open it; finally opening the envelope, Luigi finds a large, gold colored gift certificate, saying he will be alloted one free dance lesson from Shabba-Doo. Extremely grateful to Mario for this gift, Luigi says that he will get this dance lesson just in time for the Annual Plumbers' Dance. After Luigi says this, Mario says that he also signed-up for dance lessons with Shabba-Doo.
Hearing this, Luigi tells Mario that they are going to have to prepare for their dance lesson with some practice. Agreeing to this, Mario and Luigi begin to practice dancing, by spinning in place.
Later, Mario and Luigi, who are wearing rather bizarre costumes, are still practicing their dance moves, when the doorbell of their apartment rings. Hearing the doorbell, Luigi calls for whoever is there to come in. After Luigi says this, the door of the apartment bursts open, revealing Shabba-Doo, who quickly leaps down the stairs and wishes Luigi a happy birthday while high-fiving him. Luigi, who is overenthralled at meeting Shabba-Doo, begins to bombard him with praise and questions.
Eventually stopping his inquiries, Luigi and Mario watch as Shabba-Doo places several numbered footpads on the floor, saying that these footpads will help Luigi and Mario learn to dance. Instructing Mario and Luigi to use the footpads, Shabba-Doo can only watch in disdain as Mario and Luigi perform somewhat horribly at dancing.
Later, Mario and Luigi, having seemingly become better at dancing, enter their apartment and begin to dance all throughout, as Shabba-Doo plays music on a nearby stereo. Dancing like experts, Mario and Luigi are congratulating for progressing so well in dancing by Shabba-Doo, who says they'll by a hit at the Plumber's Dance.
After getting this praise from Shabba-Doo, Mario and Luigi ask him if he'll perform some of his dance moves for them, which Shabba-Doo more than happily agrees to. Performing several dancing feats, Shabba-Doo is joined in his dance performance by Mario and Luigi, who are a near match to Shabba-Doo.