October 27, 1985
4:00 PM PST

'So, what you need to talk to us about,' asked Lorraine.

'Well, there is something that I need to show you,' Doc said, slowly. Then he opened up the DeLorean door, and showed Lorraine and George the time circuis and the flux capacitor.

'Good merciful heavens!' exclaimed Lorraine. 'What on earth is that?'

'Well, uh...' Doc pondered. Then, turning to George, he asked, 'How open-minded are you to the unexplainable? I mean, you are a science fiction writer, after all.'

'Well, I know that aliens exist,' George replied, thoughtfully. 'I received a visit from Darth Vader from the Planet Vulcan back in 1955. It's amazing how those concepts came up later in Star Wars and Star Trec.'

'Well, actually, there's a very good reason,' Doc said, slowly - thankfully that George had brought up a good lead-in. 'You see, this thing is a time machine. Two days ago, Marty travelled back in time in 1955. It was Marty who pulled the Darth Vadar act on you. He had to make sure you two fell in love with each other, or else he would have been erased from existence.'

George and Lorraine looked at each other, and gasped.

'Well, I, uh, uh...' stammered George. 'I don't know what to say.'

'You mean you actually do believe me?' Doc asked, amazed.

'Well, yeah, it's all starting to make sense, now,' George said, stunned. 'I guess that explains why Calvin Klein was so persistent in wanting me to ask Lorraine to the dance, and why he seemed to fade away when some jerk had cut between us. I guess this also explains the Darth Vader and Planet Vulcan deal.'

'This also explains the underwear,' Lorraine added, stunned, 'and why I figured his name was Calvin Klein. This also explains why, when I kissed him in the car, it felt like I was kissing my brother. This also explains the weird statement about my son accidently setting the living room rug on fire - and how it actually did happen when Marty was eight, just as Calvin Klein predicted. Come to think of it, Calvin Klein did bear such a striking resemblance to my son. Oh my, this is too much to take in.'

'I figured that maybe Calvin Klein was the alien,' said George, 'and that, somehow, his existence was dependent on Lorraine and I falling in love. This makes even more sense, though, in a strange sort of way. Darth Vadar did kind of sound like Calvin Klein.'

'I guess we have no choice but to believe you, Dr. Brown,' Lorraine said, quietly.

'Well, one reason why I'm telling you this is because...' Then, after pausing a bit, Doc continued, 'through our time travel adventures, we picked up another Marty, from an alternate reality.'

'Oh, my goodness!' gasped Lorraine. 'You mean, there are two Martys now?'

'Come with me, and I'll show you,' said Doc. Lorraine followed Doc, but George stuck behind, to take everything in.

'Goodness gracious!' gasped Lorraine, when she saw the two Martys. 'I guess we'll have to say that the other Marty was our Marty's twin, separated at birth.'

'You look so different, uh, Mom,' gasped Marty. 'You look so nice, and you seem much happier, now that Daddy is alive, and you're not married to Biff.'

'I can't believe that my counterpart ever agreed to marry Biff,' said Lorraine, shaking her head. 'What caused me to make such a foolish decision?'

'You were broke when Daddy died,' Marty explained. 'Biff had promised you financial security, and he seemed so sincere - even I was fooled at first. Although, granted, I was only five at the time. Then, after you got married, Biff showed his true colours.'

Lorraine nearly fainted, with shock. She hugged Marty, and murmured, 'You poor thing! That must have been such an awful life for you.'

'It wasn't all that bad,' Marty said, managing a small smile. 'I was in boarding schools for most of the time, so I was only subjected to Biff's abuse during holidays - and during the one time I was kicked out of a boarding school, because I was so eager to prove that I was not a chicken.'

Then George walked into the corner. Marty threw his arms around his father, and began to cry.

'Oh, Daddy,' Marty sobbed, 'I missed you so much!'

'Everything will be fine, honey,' George said, soothingly, tenderly rubbing Marty's back. Marty just clung onto George tightly, and sobbed.

'His father died when he was five,' Doc explained, softly. 'He was murdered by none other than Biff Tannen.'

'He even admitted it to me,' added Marty 2. 'Although, I have suspected so right away. It was so heartbreaking to see his grave.'

'So you're the Calvin Klein that we met in 1955?' asked Lorraine, smiling.

'Yeah, I am,' replied Marty 2, blushing. 'If I didn't get you two to fall in love, then I would have been erased from existence. It just so happened that, at the same time, I got Dad to gain some courage and self-confidence.'

'Oh, Marty,' murmered Lorraine, happily. The two embraced. Then Lorraine added, 'You know, I always was confused by that comment you made about setting the living room rug on fire. I was even more shocked when that event did come to pass. Now I guess I know why.'

After about 15 minutes, Marty finally stopped crying. 'I'm sorry, Daddy,' Marty mumbled, blushing. 'It's just that I, uh...'

'No need to apologize, honey,' George said, softly - giving Marty one more tight squeeze. 'I understand.'

Then Marty looked at his parents and said, 'Mom? Daddy? If Marty had a twin brother, what would you have named him?'

George and Lorraine looked at each other, smiled - and, together, they shouted, 'Calvin!'

The Martys looked at each other, in amazement - and, together, they asked, 'Why Calvin?'

'After the Calvin we met in 1955, of course,' Lorraine said, smiling. 'I knew Marty was his preferred name - but I thought Calvin was a nice name, too.'

'I'll be Calvin, then,' Marty said, smiling.

'Welcome home, Calvin!' greeted the parents, simultaneously.

Then Marty - who will thereafter be known as Calvin - hugged his parents one more time.