They drive off with the siblings in the back seat. Old Biff was driving like a maniac. They took a sharp turn in Young Biff's driveway. Pretty sure Ally would have brain damage by this point.

"Hey, watch it, old man! If you break this car, I'm gonna kill you!" Young Biff shouted. Old Biff stops the car inside the garage. Young Biff looks behind the car to see if there was any damage. "This cost me 300 bucks!" Young Biff shouted. Old Biff rolls his eyes and said, "Would you shut up about the car?"

"Ay, and another thing, how do you know where I live?" Young Biff asked, pointing a lazy finger at him. "Let's just say we're related Biff, and that being the case, I got a little present for you," Old Biff pried on.

The siblings carefully peek over the seat to see what was going on. Thankfully, they weren't seen. "Something that'll make you rich," Old Biff added. The siblings duck back down behind the seat. Young Biff thought that this was a big joke and laughed, "Oh yeah, sure, right, ha ha, you're gonna make me rich,"

Old Biff pulls the book out and shows it to Young Biff. "You see this book? It tells the future of every sporting event of every major sports event til the end of the century. Football, baseball, horse races, boxing… the information in here is worth millions, and I'm giving it to you," Old Biff says, giving it to Young Biff.

Young Biff still thought Old Biff was joking. "Well, that's nice. Thank you very much. Now why don't you make like a tree and get outta here," Young Biff said. Old Biff then slaps him over the head so hard that his forehead nearly hits the dashboard.

"It's leave, you idiot! 'Make like a tree and leave!' You sound like a damn fool when you're saying it wrong!" Old Biff scolded. "Alright then, leave!" he shouts, throwing the book in the back of the car but Old Biff catches it, "And take your book with you!"

"Don't you get it? You could make a fortune with this book, let me show you," Old Biff said, turning on the radio. "UCLA trail 17 to 16! It's 4th and 11 with only 18 seconds left of this game! I'd say it's all over for UCLA," the announcer informed.

"Bet you a million bucks UCLA win at 19 to 17," Old Biff says, looking at a page in the almanac. Young Biff shook his head in disbelief, "What, are you deaf, old man? He just said it was over! You lost!"

"Oh, yeah?" Old Biff asked, smiling. He turns the radio up a little. "Here comes Decker with the kick, it's up, it looks good folks, it looks very good, field goal! UCLA wins 19 to 17," the announcer said. Young Biff leaned back, listening to every word the guy was saying. He was surprised that his older self was correct.

"Aright, Pops, what's the gag?" he asked. "I told you it's in this book! All you gotta do is bet on the winner, and you'll never lose," Old Biff answered. Young Biff considers this and nods, "Alright, I'll take a look at it," He throws it in the back seat, landing next to Marty's face.

Marty was about to grab it, but Old Biff grabbed it first, not seeing Marty and Ally. Marty gives Ally a look of defeat. "You damned fool!" Old Biff scolds as they step out of the car, "Never leave this lying around! Don't you have a safe? No, you don't have a safe. Get a safe! Keep it locked up, and until then, keep it with you!" Old Biff then shoves it in Young Biff's pants.

"Hey, what're you doing?" Biff asked. "Don't you tell anyone about this either. Oh, and one more thing, two kids, or a crazy wild-eyed scientist is going to be asking for that book," Old Biff said, his voice getting fainter as he and Young Biff walked off, shutting the garage door behind them.

"Um, Marty, tell me that's not what I think it is," Ally said, hearing it being locked up. They jump out of the back seat and see the garage door is shut. "Yep, we're trapped," Marty said, trying fruitlessly to open the garage door.

Marty pulls out the walkie-talkie, "Doc, come in, over!" Doc's voice came through the device, "Marty, Ally, what's the report?" "He's gone, Doc!" Ally said, seeing the windows were too small for them to crawl through.

"His future self gave him the book! We're locked in Biff's garage, over," Marty explains. "Doc, can't you fly the Delorean over and get us the hell out of here? The address is 1809 Maple Street, over," Ally informs him. "No, Allison, I can't take the Delorean out in the daylight, but don't worry kids, somehow I'll get over there, over and out!" Doc answered quickly, hanging up.

"Whoa, Doc! Wait a minute, Doc!" Marty exclaims. But there was no answer. "Oh, that's perfect," Ally said, "Well, on the bright side, it does beat staying locked up in a damn closet for about 5 hours,"

Marty raised a brow at his sister, "What's with you and the jokes, Ally?" "Marty, I do it to relieve tension. I'm trying to hide the fact that this whole thing is making me scared," Ally said, leaning on the back of the car with her arms crossed over her chest.

Marty knew that his little sister wasn't one to be easily scared. She could watch a horror movie and be totally fine afterward. However, that night at the dance, she couldn't feel more afraid.

Marty leaned beside her, now concerned. "What's making you scared, Ally?" She looked at him for a moment before looking down at her feet. "Tonight. When you started to vanish, I thought I was gonna lose you." she stopped, starting to cry, "God… that was the most frightening thing that happened to me…"

Marty felt sympathetic for his little sister. They have been close since they were little kids. Even with all the ups and downs, all the fights, she was still one of his best friends. Hearing that broke his heart.

"Oh, Ally… I won't leave you," Marty said, pulling her into a hug with a grunt, "Not ever…" Ally hugged him back, just letting him do what he needed to do to help her get better.