"Doc, success, we got the book!" Marty spoke through the walkie-talkie. Doc rose up from the front of the Delorean, sighing in relief. "Thank goodness!" he said, walking to the back and he grabbed the walkie-talkie. "Great job, you two! As soon as I reload the fusion generator, I'll meet you both on the roof of the high school gym," Doc informs them.

"On the roof, 10-4, Doc," Ally said. They hang up and put the device in Marty's pocket. They turn the corner and instantly run into Biff's friends. "Hey, it's them!" 3-D said. "And they're in disguise!" Skinhead said, pointing at them.

Marty quickly points in another direction and asked, "Guys, what's that?!" They turn to look at what Marty was pointing at, which was nothing. Marty pushes them over and they sprint past them.

Meanwhile, with Doc, he had fixed the Delorean and he takes off, hitting the Lyon Estates billboard. "Damn!" he swore. He accidentally turns the time circuits on, and the bump caused the destination time to JAN 01 1885 12:00 am. However, Doc doesn't notice this. The Delorean flies off with the flag pennant attached to the right rear wheel.

They run into the gym, where they see George and Lorraine dancing. George looked up at the stage and waved to the other Marty and Ally. They watched as their parents kissed and they both smiled and glanced at each other.

However, the gym door opened and Marty quickly pulls Ally underneath a table, dropping his hat but he grabs it just in time. Biff's friends stand in front of the table. "Let's do another one!" Marvin exclaimed from the stage.

Biff's goons looked around the gym for the siblings. "Where'd they go? They just came in here!" Skinhead shouted. 3-D spotted the other Marty and Ally up on the stage, getting ready to perform Johnny B. Goode. "Look, how'd they get up on stage so fast?" 3-D asked.

"I dunno, but when they get down, we're gonna nail them!" Skinhead said. "How'd they change clothes so fast?" Match wondered. They run through the crowd and up the stairs to the side of the stage.

They were waiting for the other Marty and Ally to finish the song before jumping them. Only the present Marty and Ally see them. They stand up from under the table and hide behind a large decoration. Mary pulls out the walkie-talkie and gets ahold of Doc.

"Doc, Doc, come in!" Marty said in a panic. "Marty, come in! What's going on you two?" Doc answered. "Doc, Biff's goons chased Ally and me into the gym and they're gonna jump… us!" Marty reported, looking up at the stage. "Then, get out of there!" Doc replied urgently.

"No, Doc! He means the other us! The ones on stage playing Johnny B. Goode!" Ally explained, looking at the stage and watched herself and Marty play that song. "Great Scott! If they catch they catch you two, you won't make the lightning, you won't get back to the future and we'll have a major paradox!" Doc shouted, seeing the problem.

"Wait, wait, a paradox? You mean one of those things that could destroy the entire universe?" Marty asked, freaking out at this. "Precisely! Marty, Ally, you have to stop those guys at all costs without being seen by your other selves, or your parents!" Doc responded. The siblings look at their parents, who were still dancing before exchanging 'Here we go again looks.

While this was happening, Biff wakes up after Ally had punched him. He gets to his feet and said, "Where are they?" "Who?" a guy asked.

"Calvin Klein and Cyndi Lauper!" Biff said. The guy still didn't know who he was talking about. "The guy and girl with those hats! Where are they?" Biff elaborated. "Oh, they went that way!" the guy said, pointing towards the gym. Biff sprints off towards the gym.

Marty hung up before they sneak around onto the stage without being seen. Ally pointed to where Biff's goons were. They were definitely waiting for them to finish to jump them. Marty had found some sandbags hanging right above them.

"Wait here, Ally," Marty whispered. "Alright," Ally said, going to hide behind the curtain. She watched as her brother climb the rigging above the stage and watched as he crawls across it. Ally held her breath when she saw him reach for the rope to the sandbags, pulling it, letting the bags fall on them.

The impact knocked the three guys unconscious. "Yes!" Ally whispered just as things go silent just as the other Marty finished his guitar solo. Present Marty climbs down the rigging and waved Ally over. Ally made her way over, having to use the back curtain to get to her brother.

The siblings dash down the stairs to get to the back door. "Doc, success. Everything's cool," Marty reported to Doc. "Great, I'll be landing on the school roof in about 1 minute," Doc says. "We'll be there," Ally says.

The two exit the gym but stay by the doors. They watch as their other selves walk down the stairs and approach Lorraine and George. Their trance was broken by a deep masculine voice.

"Hey, buttheads!" Biff says. Marty and Ally look at him, smiles dropping. Biff had a swollen lip and a black eye. "You think those disguises can get by me? Let's have it out. You and me, Calvin, right now," Biff snarled.

"No thanks," Marty said, grabbing his sister's hand. "Yeah, we don't have time for this," Ally added. The siblings turned and start to walk away. Biff wasn't having any of this, however. "Hey! Where are you two going?" Biff barked but they continued walking. "Is he chicken?" Biff mocked.

Marty stopped dead in his tracks at the insult. "Yeah, that's it, isn't it. Your brother's nothing but a little chicken," Biff mocked again, pissing Marty off even more. Marty lets go of Ally's hand and slowly turns to look at Biff, glaring at him.

Marty walked up to Biff and starts to say, "Nobody calls me chick-" The door swings open, slamming Marty in the face, knocking him into the wall. Ally watches as their other selves run out of the building and right by them.

Ally runs to her brother, who collapses on the ground in a daze. "Marty, are you okay?" she asked before Biff shoves her out of the way. "What the hell?" Biff says in disbelief, leaning down to grab the almanac. "You steal my stuff?" Biff scowled.

Biff kicks Marty hard on his stomach, making him cry out in pain. "And this one's for my car!" Biff shouted, kicking Marty again. Ally quickly ran at Biff with a raised fist. "Leave him alone!" she shouted, throwing her fist at him.

However, Biff grabs her wrist and slapped her again, knocking her to the ground. "You stay out of this, bitch!" Biff scowled, walking to his car. Marty gets to his feet and makes his way to his sister. "Are you okay?" he asked, helping her up.

"Gnh, yeah I'm fine," Ally said, rubbing her sore cheek. They walk to catch up to Biff, but he drives off before they could. They run up the stairs to catch up with Doc, who was waiting for them at the school rooftop.

"Doc! We blew it! Biff nailed us and took the book! It's our fault, Doc! We shouldn't have let Biff get to us," Marty explained. Doc shook his head, running to the edge of the building, and asked, "Nevermind that now! Which way did he go?"

"East, towards the River Road tunnels," Ally replied. "Get in!" Doc commanded.