6:30 PM PST
As the time travellers broke the time barrier, and headed in 1955, Doc parked the DeLorean behind the Lyon Estates billboard - the same place where Marty had parked the car a week earlier.
'Ah, this is heavy, Doc,' said Marty, with a sigh. 'I mean it's like I was just here yesterday.'
'You were here yesterday, Marty,' Doc reminded Marty. 'You were. Amazing, isn't it?'
'Yeah, I guess,' said Marty, with a weary sigh.
'So we're in 1955, now?' asked Calvin. 'I've always wanted to visit this era.'
'Now, Cal,' chided Doc, gently. 'We're not here on a pleasure trip. We are here to grab the almanac from Biff. Now, if my calculations are correct, Biff from 2015 should be leaving in seven minutes and 12 seconds. Then you guys go into town, and track down Biff and tail him. Also, you two must try to keep your distance from each other, and not let Marty's younger self see either of you. Got it?'
'Got it!' Calvin and Marty replied, simultaneously.
'Remember that your name is Calvin Klein,' Doc reminded the twins.
'Wait a minute!' gasped Calvin. 'Marty is the Calvin Klein that our parents have been talking about all those years? This is heavy, all right!'
'I'm sure that's why our parents named you Calvin,' said Marty, with realization. 'My mom saw my purple underwear, and she thought that my name was Calvin Klein - but I insisted on being called Marty. So because we're twins - well, I'm sure you can guess the rest.'
'Whoa, this is heavy!' gasped Calvin. 'Way heavy! It seems so surreal that this Calvin Klein that our parents told us about all this years was really you - and you just returned from 1955 yesterday.'
'Okay, boys,' said Doc, 'Once Old Biff has gone, grab the almanac any way you can. Remember that our futures depend on this!'
'You don't have to remind me of that, Doc!' protested Marty.
'Here are some binoculars and a walkie-talkie for each of you - so we can all keep in contact,' said Doc. 'I'll stay here and try to repair the shortened time circuits. That way we don't risk anyone else stealing the time machine, and I won't risk accidentally running into my other self.'
'Your other self?' asked Marty, confused.
'Yes! There are now 2 of me here,' Doc explained, 'and there are 2 of you here. Well, actually three, counting Calvin.'
'Hey, now, Doc,' protested Calvin, 'I'm not just another Marty! I'm my own person!'
'Right, of course,' agreed Doc. 'I just meant that, as far as everyone else here in concerned, there is only one of you here.'
'Can't I just pretend to be Calvin Klein's twin?' asked Calvin. 'Maybe I could be Marvin Klein?'
'No, that could create a paradox,' protested Doc. 'Remember that Marty's younger self is also here. If someone mentions a Marvin Klein to Marty's younger self, that could create a paradox.'
'Oh, yeah, I guess I didn't think of that,' mumbled Calvin.
'Anyway, as I was saying,' Doc explained, 'The other me is the Dr. Emmett Brown from 1955, the younger me that helps the younger Marty get back to 1985! Marty, remember the lightning bolt at the clock tower?'
'Yeah,' answered Marty.
'That event doesn't happen for over three hours, so you must be very careful not to run into your other self,' explained Doc. 'This goes for you, too, Calvin. Let me give you guys some money.' Doc then reached into his briefcase to pull out some money, and continued, 'Have to be prepared for all monetary possibilities! Get yourselves some 50's clothes.'
'Check, Doc,' replied Marty and Calvin, simultaneously.
'Something inconspicuous!' Doc called after the twins.
oooooooooo
At the clothing store, Marty was going to pick out a leather coat, some sunglasses and a hat - but Calvin had stopped him.
'Marty, that is hardly inconspicuous!' Calvin protested. 'When Doc gives us an order, it's for a reason!'
'Fine, whatever, Cal,' mumbled Marty. 'It's just that everything else here is so boring.'
'Yeah, Marty, but this is the 50s,' argued Calvin. 'Things are different here. We need to blend in with the other teens of this time period.'
'Fine, I guess you're right,' said Marty, with a sigh. 'Still, it's just that I...'
'Come on, Marty!' Calvin insisted. 'We don't have time to stand here and argue. We have a mission to accomplish.'
'Oh, all right,' Marty reluctantly agreed. 'I guess we do have more important things to worry about.'
'Yeah, like restoring our timeline,' Calvin insisted.
oooooooooo
After the twins had finally purchased some inconspicuous '50s clothing and left the store, Marty and Calvin then parted ways, and they went looking for Biff. Calvin headed off for the school, while Marty looked for Biff's home.
'Doc, come in, Doc,' called Marty, on his walkie-talkie, 'this is Marty, over.'
'Roger Marty, this is Doc,' Doc answered. 'Are you there?'
Marty looked through the binoculars. He was looking at a house, filled with garden ornaments and a sign - No Trespassers - Violators Will Be Prosecuted. This Means You! Wow, so this is where Biff lives, eh?
'Yeah Doc, I'm at the address,' replied Marty, looking at the front door. 'It's the only Tannen in the book, but I don't think it's Biff's house. It looks like some old lady lives here.'
Just then, Marty saw Biff heading out of the garage to un-padlock the lock. Then Biff seemed to have forgotten something - probably his almanac - and he ran back into his house. As Biff went into the house, Marty sneaked into the back of Biff's car - and lay down low, to avoid being seen. The almanac was not to been seen in the car.
'Doc, it is Biff's house,' Marty told Doc, on the walkie-talkie 'I'm on him. Over.'
'Biff! Biff, where're you going now?' called an elderly lady's voice, possibly Grandma Tannen.
'I told you, Grandma,' Biff replied, huffily, 'I'm going to the dance!'
'When are you coming home?' asked Grandma Tannen.
'I'll get home when I get home!' Biff huffed.
'Don't forget to turn off the garage lights!' shouted Biff's grandmother.
Biff then stepped into the car, set his almanac on the dashboard, then drove off. He did not notice Marty in the back of the car.
'Doc, Doc,' whispered Marty, on the walkie-talkie, 'I'm in the back of Biff's car. He's on his way to the Enchantment Under The Sea Dance. When Calvin and I parted ways, he headed off to the school.'
'I'm hiding in the men's room,' called out Calvin.
'The book is on Biff's dashboard,' continued Marty. 'I'll grab it as soon as we get to the school.'
'Marty! Calvin!' called out Doc, 'You must be extremely careful not to run into Marty's younger self.'
'My younger self?' asked Marty, confused.
'Yes! Remember, your mother is at that exact same dance with you! Yeah!'
'Yeah, this could get heavy, Doc,' proclaimed Marty.
'Yeah, I totally concur,' added Calvin. 'Not only that, but I suppose the current Marty and I need to keep our distance from each other, right?'
'That is correct,' replied Doc. 'Whatever happens, you must not let Marty's younger self see either of you. The consequences could be disastrous.'
'I don't doubt it, Doc,' Calvin replied.
oooooooooo
'Excuse me, sir, called a familiar-sounding voice. Doc turned around, and noticed that it was his younger self from 1955. 'Yes, you with the hat.'
'Who me?' asked the elder Doc.
'Yes, be a pal and hand my five-eighths wrench out of that toolbox,' the younger Doc requested.
'Five-eighths?' asked the elder Doc, keeping his back to his younger self. 'Don't you mean three-quarters?'
'Why, you're right,' exclaimed the younger Doc.
'I presume you're conducting some sort of weather experiment,' asked the elder Doc.
'That's right,' replied the younger Doc, stunned. 'How did you know that?'
'Oh,' replied the elder Doc, 'I happen to have a little experience in this area.'
'Yes, well, I'm hoping to see some lightning tonight,' explained the younger Doc, 'although the weatherman says there is not going to be any rain.'
'There's going to be plenty of rain all right,' assured the elder Doc. 'Wind, thunder, lightning. It's going to be one hell of a storm.'
'Well, thanks,' replied the younger Doc. 'Nice talking to you. Maybe we'll bump into each other some time again in the future.'
'Or in the past,' mumbled the elder Doc, as he got onto his bike and drove away.
The younger Doc had then noticed a familiar ringing of bells, and he glanced around him a bit.