- French Narrator
- Patchy the Pirate
- Potty the Parrot
- Jellyfish (in drawings)
- Bronty the Patchysaurus (debut)
- Choir (debut)
- Cavemen (debut)
- Cavey (debut)
- SpongeBob SquarePants (2 cameos)
- Eugene H. Krabs (cameo)
- Ammonite (cameo)
- Dorudon (debut)
- Prehistoric bug
- SpongeGar (debut)
- Prehistoric Gary (debut)
- Squog (debut)
- Patar (debut)
- Barbershop Quartet (debut)
- Albert Einstein (debut)
- Primitive Jellyfish (cameo)
- Prehistoric Krabs (debut)
- Patchy's mom (mentioned)
- X-29488 (debut)
- Creature in Squog's painting
- SpongeBob (primitive) (cameo)
- Patrick (Primitive) (cameo)
- Squidward Tentacles (cameo)
- SpongeTron (cameo)
- T. rex (debut)
The French narrator begins the episode by introducing another SpongeBob SquarePants special, hosted from Encino, California as it was 100 million years ago. From his cave-house, Patchy the Pirate, in a caveman costume, is introducing prehistoric times and talking about how great they were. However, Potty, in a futuristic robot costume, appears and says that prehistoric times were "lame" and the future is "where its at."
They begin arguing over whether SpongeBob himself likes prehistory or the future better. While working at the Krusty Krab, SpongeBob feels a disturbance and tells Mr. Krabs that "I've got the strangest feeling that somewhere a pirate and parrot are arguing about me. And, the parrot is winning." As Patchy and Potty continue to argue, Patchy begins the episode.
The cartoon features prehistoric ancestors of SpongeBob, Squidward, and Patrick, named "SpongeGar," "Squog," and "Patar," respectively. SpongeGar, who is sleeping in his pineapple-shaped cave, is awakened by a distant herd of monstrous purple creatures, who produce a sound identical to that of SpongeBob's alarm clock that knocks the rock on SpongeGar. SpongeGar wakes up and takes his version of Gary, who is bigger than the prehistoric pineapple itself, out for a walk, and the large sea snail leaves a slime trail all over Squog's front yard. Squog comes out with one of his two clubs to complain to SpongeGar, but slips on the slime trail, sliding into Patar's rock, awakening its occupant, and eventually crashing back into his own house. SpongeGar and Patar begin to play, and SpongeGar uses a hollow log to blow a bubble. It then starts raining, and eventually lightning strikes the log, setting it on fire.
As the act ends, the three cavemen experiment with it, burning themselves in the process. Very soon, SpongeGar realizes that it can be used to cook food. The three begin cooking various items with it. These include flowers, the top of a mushroom, a kelp reed, a wood stick, a prehistoric ancestor of Eugene H. Krabs, seaweed flowers that look similar to corn on the cob, a green plant that looks like spaghetti, rocks that take the form of popcorn, and a Krabby Patty made of sand.
Over the commercial break, Patchy and Potty continue to fight, now keeping score between the future and the past. Patchy then brings in a real live caveman, but Potty brings in a futuristic robot who begins repeatedly shooting the caveman with lasers.
At the end of the day, SpongeGar, Patar, and Squog are full from eating and say goodbye to each other as they head over to their homes. Suddenly, SpongeGar, Patar and Squog stop walking and they turn around, realizing that the fire is still out there. The three of them start fighting over who will keep the fire. They continue fighting until it starts raining again and puts the fire out. SpongeGar and Patar apologize to each other for fighting, but Squog blames them for putting it out and attempts to hit them over the head. Before he can do so, however, lightning strikes him and SpongeGar and Patar cook marshmallows over his charred body.
After the episode ends, Patchy is shown sitting outside his cave, apparently having lost to Potty. However, Potty comes outside and invites him back in, where Cavey the Caveman and the Robot Android Cyborg DX-294888 do a rap called "When Worlds Collide."
Patchy began to have a change of heart about "loving" the future. The song montage features scenes from SpongeBob B.C. and "SB-129." The episode ends with Potty giving Patchy a "gift from the prehistoric times," that being a Tyrannosaurus Rex, which begins chasing him. Patchy says goodbye to the viewers, finishing the episode while being eaten by the Tyrannosaurus Rex.
- Patar putting salt on items and then eating them except Squog's tentacle, who hits Patar on the head to stop him from gnawing his tentacle.
- Potty eating popcorn and saying "This is great" whenever bad things happen.
- Squog slipping on Gary's slime trail and crashing at a house.
- SpongeGar, Squog and Patar eating different things after roasting them on the fire until they have eaten everything in the area.
SpongeGar, Patar, and Squog speak in a primitive language similar to English. Many words and sounds are taken from or based on English words/sounds.
|Banooga Ready!||I'm ready!|
|Tabanga do?||it belongs to you, not me!|
|Wait a minute||wait a minute|
|Sutaka jakasa!||why you little!|
The French narrator saying "Stay tuned to SpongeBob B.C.," Patchy getting hit with a big rock, and the French Narrator saying, "They discovered fire. How long are they gonna take to mess it up? Let's see" are all cut from The Complete 3rd Season and The First 100 Episodes DVDs due to there being no commercials. These scenes are still intact on the SpongeBob Goes Prehistoric DVD and VHS. It can also be found on the Nick Picks Volume 1 DVD.
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ A Pirate's Life for Me (A) - Ron Goodwin [Opening music]
‣ Monster Bug [#33] - Gregor F. Narholz ["...100 million years ago!"]
‣ 'Er Indoors - Johnny Hawksworth [Patchy riding a fake dinosaur/Patchy talks about prehistoric times]
‣ Lonely Stranger - Laurie Johnson [meanwhile at the Krusty Krab]
‣ 'Er Indoors - Johnny Hawksworth [Patchy and Potty arguing]
‣ Pulse of Africa - Robin Hogarth ["Ugh" title card]
‣ Moon Walk - John Fox [primordial sea]
‣ Hawaii Jive Ho - David Jones [SpongeGar wakes up]
‣ Cucu Chama - David Bradnum [Squog complaining about slime trail]
‣ African Xylophone [#97] - Mark Nolan ["Wait a minute..."]
‣ Upward Glide - Eric Allen ["Wait a minute..."]
‣ Cucu Chama - David Bradnum [Squog complaining about slime trail]
‣ Natives Bulletin - Jonny Teupen [Patar eats slime off Squog]
‣ African Xylophone [#97] - Mark Nolan [Squog yells at Patar.]
• Idea Vibe - Nicolas Carr ["Huh?"]
‣ Sangoma D - Richard Siluma [SpongeGar and Patar hitting themselves]
‣ Nyala - David Bradnum [rain]
‣ Cucu Chama - David Bradnum [thunder/lightning]
• Drama Gong - Nicolas Carr [gong]
‣ Pulse of the Earth - Mauricio Venegas-Astorga [fire]
‣ Bongo Crazy [#43] - Martyn David, Alan Bell, Roger Stephen Dexter [SpongeGar and Patar scream in pain]
‣ Pulse of the Earth - Mauricio Venegas-Astorga [Patrick eats his hand]
‣ Glissando Up - Eric Allen [Squog hits Patar]
‣ Alpha to Omega (B) - Dave Hewson [SpongeGar stares at the stick.]
‣ Proclamation A - Gregor F. Narholz [SpongeGar gets an idea/Squog eats the plant.]
• Tymp Fanfare - Nicolas Carr [overlays Proclamation A]
‣ African Flute - Friedel Berlipp [roasting things over the fire]
‣ Bell Hop (a) - John Shakespeare ["I told you prehistoric times were fun!"/Robot attacks Cavey/"Welcome back to SpongeBob SquarePants B.C. Sounds like things have gone from bad to worse for Patchy. Let's watch."]
‣ African Flute - Friedel Berlipp [roasting more food]
‣ African Percussion (G) - Robin Hogarth [SpongeGar and Squog hitting each other]
‣ Pulse of Africa - Robin Hogarth [they fight over the log]
‣ Bare Foot - Robin Hogarth [Squog struck by lightning]
• End Gong - Nicolas Carr [gong]
‣ The Dreadnought Tea Clipper (B) - Tim Laycock, Robert Alexander White ["Now I know how Squidward feels."]
◦ When Worlds Collide - Theo Mondle, Paul Tibbitt, Kent Osborne
‣ Monster Bug [#33] - Gregor F. Narholz [dinosaur]
‣ The Girl I Left Behind Me - Brian Peters [ending]
• B.C. Strut - Steve Belfer [closing credits]
- This episode is available on the SpongeBob Goes Prehistoric DVD and VHS, Nick Picks Volume 1, Complete 3rd Season, Nick Picks Box-Set (Vol, 1-3), The Ultimate Box Set, Nickelodeon Double Feature, First 100 Episodes, Exposed!: The Ultimate Box Set, SpongeBob's Legendary Adventures, The Ultimate SpongeBob Box Set, SpongeBob SquarePants Vol. 5, From the Beginning, Part 2, Complete Third Season, The SpongeBob SquarePants Collection, The SpongeBob SquarePants 8 Season DVD Collection, Favorite Episodes, Triple Pack 4, 2-Season TV Pack, The Third & Fourth Seasons, Big Hits: Volume 2, and The Best 200 Episodes Ever DVDs.
- "Ugh" was ranked #16 during the Best Day Ever event from November 9–10, 2006.
- This episode was ranked #48 in the "Top 100 Greatest Nicktoon Episodes" as part of "Super Stuffed Nicksgiving Weekend."
- This episode was nominated for an Emmy at the 2004 Primetime Emmy Award for Outstanding Animated Program (for Programming Less Than One Hour).
- This episode is also listed as "SpongeBob B.C. (Before Comedy)."
- This episode and "F.U.N." tie for the shortest episode title in the series, with only three letters.
- However, in terms of characters, this is the shortest title, with three characters in total.
- This is the first episode where SpongeBob appears as a cameo.
- This is the first episode to use stock footage from previous episodes. For instance, the scene with the Primitive Jellyfish first appeared in the episode "SB-129."
- In production order, this is the second double-length episode of season 3. The first is "Party Pooper Pants."
- In the French dub, according to the French narrator, the episode takes place 100 millennia ago, but this is orders of magnitude inaccurate in light of the coexistence of various creatures seen in the episode (see approximate timeline below).
- Squog says "Wait a minute" at one point, the only full English sentence spoken by any of the cavemen.
- This episode marks the third time an episode has a unique opening credits sequence, the first two being "SB-129" and "Krusty Krab Training Video."
- Excluding the narrator, Patchy, Potty, Cavey, Potty's Robot, the actual SpongeBob and Mr. Krabs during the "Meanwhile" time card, none of the dialogue in this episode was edited in the Korean dub.
- The activities of SpongeGar, Patar, and Squog paint an (inconsistent) parallel with those of late archaic human species and early modern humans. It is thought that homo ergaster might have had a language, homo erectus discovered fire, and early modern humans domesticated animals, in that order. However, SpongeGar has a pet, and speaks a language with the other two, by the time all three discover fire onscreen. However, this discovery was made underwater, so the "late" discovery of fire (still around 150 million years earlier than homo erectus, according to the above timeline) can be excused.
- The episode marks the first time that one of Squidward's ancestors is seen, and the second time Patrick and SpongeBob's ancestors are shown.
- There is an online game based on this episode called B.C. Bowling.
- The atonal singing choir, according to the episode's credits, is made up of Tom Kenny, Bill Fagerbakke, Rodger Bumpass, Mr. Lawrence, Dee Bradley Baker, and Sirena Irwin.
- This is the first episode in which none of the ten main characters have a major appearance.
- The atonal singing of the barbershop quartet is a reference to the piece "Requiem for Soprano, Mezzo Soprano, Two Mixed Choirs, and Orchestra" by György Ligeti, which was used in the film, 2001: A Space Odyssey, whenever the monolith appeared.
- The scene in which SpongeGar realizes that he can use a stick as a tool to take a piece of coral out of the fire pays direct homage to the Dawn of Man sequence from the film 2001: A Space Odyssey, a famous scene in which a group of apes learn to use a bone as both a tool and weapon. In both cases, the narrative has portrayed these stories without the use of conventional dialogue (using nonsensical cave-ish speech in Ugh and using ape noises in 2001).
- The music is also a direct homage, with a modernistic wailing piece and music similar to the classical piece "Also Sprach Zarathustra" by Richard Strauss played after SpongeGar's discovery, mirroring the use of said pieces of music in 2001.
- B.C. standing for "Before Comedy" is a parody of the Dionysiusian term "Before Christ."
- The black and white stock footage of cavemen was taken from the 1914 silent film Brute Force, the first live-action dinosaur film.
- When Patar punctures his lip, the stick is thick, but when SpongeGar stomps on a little crab, takes the stick out of Patar's lip, impales a small crab, and gives it to him, the stick is thin.
- When Prehistoric Gary makes a snail trail on Squog's rocks, it is on the one closest to his house, but when Squog looks out the window, it is on the third one from his house.
- Squog does not have a door in his house until he takes the fire to it.
- When Squog snatches the fire from Patar, there is a flash of yellow as if SpongeGar took it.
- Patchy's hook is shown on his left hand when he tells the audience that it was easier to hit a baseball in the Prehistoric times and tries to create fire, while in other scenes, it is on his right hand.
- In the next frame, after he introduces himself, he does not have his hook.
- While SpongeGar sniffs his first charred flower on a stick, the roots are seen over his beard where the root parts over his beard are red.
- When Squog chooses which club to use, he puts the one he did not want on the right. When it shows a close-up view, it is moved to the left.
- When SpongeGar falls from the rope, it is implied that he falls into a pile of leaves. However, in both the shot where SpongeGar gets trapped and the one where he sees Patar and Squog running after the log, there are no leaves around.
- During the visual of an ancient drawing of SpongeBob and Patrick squeezing up and down while "When Worlds Collide" plays, at one point during the animation loop, SpongeBob is missing the line that is supposed to resemble his pants.
- Patchy has brown eyes throughout the episode, but when his eyes bulge out of his head, they are blue.