During the Biggie Box sale, Ben enlists Simon Sez to help him find Max and get back to the register with his toys before the sale ends and Billy Billions buys them instead.
The episode begins with the Tennysons at Biggie Box very early in the morning. Max and Gwen are tired, and Ben is excited. Gwen questions why they had to stand in the front of the line. Ben explains that every year, Biggie Box releases items that can only be bought during the one hour sale. Gwen asks what he's getting, and Ben responds saying he'll finally get the Sumo Slammer Mojo-Dojo playset. Max reminds Ben that it's just a toy, and happiness can not be bought. Mr. Biggie steps out, and addresses the rules to everyone. Right after, Billy Billions arrives. He cuts to the front of the line, and Ben tells him to get to the back. Billy explains that getting to the front is one of the perks of his membership card. He states that he is there to buy one thing, and it's the Sumo Slammer Mojo-Dojo playset. He activates his roller-skates, and runs into the store. Ben transforms into Cannonbolt, and races Billy Billions to the aisle the playset is in. Ben times out, but is almost close. Billy's rocket shoes also fails, and he is forced to run.
They both soon meet in the aisle, where the toy they're after is sold out. Simon Sez steps out with the playset, and Ben tries to convince Simon to give it to him. Billy claims that he isn't too in to Summo Slammers. He just wants he batteries so he can charge his backpack and smash it. Ben argues to let him take the toy, and he'll help Simon find a less "smashy" toy. Billy then points out that Simon is wearing a Mark 2 Billions Backpack. He takes out a battery, and offers to give it to him in exchange for the playset. Ben then says that if he can't give him the playset, then they can't be friends. Simon drops the toy in shock, and Ben takes it and runs away. As Ben runs, he feels bad at what he did. As he's running, he notices that he's going the wrong way. Billy rides in and takes it from him, stating that he didn't know Ben had it in him. He also states that he'd make a great bad guy. Simon then arrives telling Billy that the battery he was given doesn't work. Billy states that he didn't say it would work, and this angers Simon.
Simon takes out a pack of batteries, and attacks the two. Ben states that Simon didn't like Summo Slammers, but he states he doesn't like "stinkers" like Ben. Ben claims that Billy is the stinker, and is a spoiled rich brat who would do and say anything to get what he wants. Simon remarks "Like you?". Ben then admits that he is a stinky, and prepares to apologies, but Billy interrupts by knocking Ben over and taking the toy. Simon then chases after Billy. Billy manages to trip Simon, and he stops to look at a 2 story refrigerator. Ben comes in to tell Simon to be better than them, and not to hurt Billy. Billy, however, fires the rocket fist. This knocks over many giant shelves, and they almost hit the people. Luckily, Ben goes Omni-Enhanced Wildvine and saves them with his vines. He struggles to hold the shelves up any longer. OE Wildvine orders Gwen to get everyone out. Ryan then orders Simon to help Ben, and they both save everyone. Ben thanks Simon, and Simon hopes that Ben learned something this day. Billy shows up and says he hopes that they all learned that he always wins. He checks out his toy at the cash register, and attempts to use his car. Mr. Biggie shows up and revokes his card since he caused too much damage. Billy's butler carries him out as he rages. Simon apologizes for Ben not getting his toy, but Ben states it's okay, as happiness can't be bought. Ben looks over to Max and Gwen, who are now happy that they've bought all of this new stuff.