Back to the Future Explained | The Big Bang Theory

“I have long suspected that the idea of an African American president was stolen from the movie 'Deep Impact.’”

Season 8 Episode 5: The Focus Attentuation

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[PedroR]

1:37 As a foreigner (Brazilian) who is studying English, this part of the episode is a very difficult challenge 😂😂😂

[vidadiva]

I love sheldon being proud of Leonard. "That's my boy"

[theresalong]

0:49 "I'll make the popcorn."

Still can't stop laughing at Raj's happiness 😂😂

[AtlasBlizzard]

"Unlike Hot Tub Time Machine, this couldn't be more simple."
An incredible quote, with or without context. 😂

[AriesWarlock]

Also, according to the comics, it takes time for a new timeline to be formed and it's inhabitants to be erased as seen in the first movie where it took time for Marty to be erased.

[dragonstryk]

Theres an in-universe explanation for this: We'll remember that in Back to the Future Part 1, Marty throws off the timeline in 1955, but the temporal impacts aren't immediate, i stead building up over time asarty's siblings start fading from his photograph.

The form of time travel that Marty and Doc are using in the movies has some sort of temporal ripple to it that does take time to alter the original events.

[GamerplayerWT]

“We gotta watch Back to the Future 2.” Great discipline, guys! Hahahahaha!

[MrProjecthalo]

This is when they prove that Sheldon is not a robot that can get stuck in loop.

[jasondewhurst]

can we just take a minute to appreciate the compexity of this scene by jim, flawless as always.

[jaredtomlin]

I always thought that old Biff could return to the unaltered 2015 because the ripples in the timestream had not yet caught up to him in that time. In a deleted scene, old Biff fades away as a result of the altered timeline, but he only does so after Marty and Doc leave to go back to 1985. Therefore, it would be possible for him to return to the original 2015 before the changes in the timestream begin to manifest.

[JoelGrant-iely]

Memorizing then repeating Sheldon's script is incredible.

[piusdoe]

Considering Sheldons rudeness and superiority, Him saying that's my boy is actually a pretty underrated moment

[mijimonmaster]

Multiverse theory allows every possibility to happen.

[highroyds]

The one moment Sheldon doesn’t agree with what others have said…
Future biff takes the Almanac back to the past 1955, then has just enough time to return back to the future to return the car. Once Marty & Doc get back into the car this is when future biff starts to fade as the future is starting to alter. Marty & doc then travel back with Jennifer to 1985 which has now changed to the alternate version as they were protected while they were travelling between the time periods.

[JonatasAdoM]

First time I ended up with a headache. Now it starts to make sense lol.

[deadiemeyers]

Kudos to them all for the flawless execution of what had have has to have been a very challenging script to have had has memorized. 😂

[NickTidder-nffb]

Kudos to Jim Parsons for his lengthy exposition of the multiverse theory although Back to the Future 2 was my least favourite of the trilogy - this episode was an excellent example of need valhalla 😅

[TheConfidentNoob]

I love how Raj says “I’ll make the popcorn”😂 It makes me laugh everytime😂

[AscheWholeProductions]

This right here is a great explanation why I freakin' hate movies/shows/stories that rely on time travel as a major plot device.

[gcHK]

The alternate future was erased because Lorraine McFly shoots Biff dead in alternate 1994. That is why Old Biff appears to be having a heart attack when he returns to 2015; a deleted scene reveals that he was actually being erased from existence by the actions of Alternate 1994 Lorraine.