- Eugene H. Krabs
- SpongeBob SquarePants
- Squidward Tentacles
- Incidental 104 (cameo in movie)
- Incidental 154
- Incidental 119
- Incidental 93
- Old Man Walker
- Viking Incidentals (debut)
- Vahalla (mentioned)
Mr. Krabs creates a "Viking promotion" at the Krusty Krab by serving Regular, Large, and Viking Sized Drinks (which really are all the same size) in a bid to save the restaurant money, yet at the same time, to fool the customers into paying more money for the same size drink. He also states that whoever orders a Viking Sized cup tries on a cardboard helmet (that he found in his attic) which is also a gimmick for more money. This gets SpongeBob interested in Vikings. Squidward then teaches him about Vikings, though nothing he said was true.
SpongeBob sends a letter to the Vikings, although it is immediately thrown out, as the letter does not have a valid address on it (SpongeBob wrote "To Vikings" with a heart). Meanwhile, at the post office, a garbageman (who reveals to be a Viking) notices it and delivers the letter to the Viking Chief.
The chief then sends his men to the Krusty Krab to teach them about the Vikings (which is redecorating, appropriating, and liberating), and they abduct SpongeBob and Squidward.
The Vikings bring SpongeBob and Squidward to their ship, where the captain, Gordon, introduces his crew, which all share the name, Olaf. SpongeBob asks what they do for fun (which is just throwing a shield), and one of the Vikings says they like to sing songs, even though they actually do not sing, and he then gets catapulted off the ship. The Vikings proceed to make SpongeBob the head chef, and Squidward the bathroom attendant. Soon afterward, Squidward complains about the poor lifestyle, which results in the Vikings tying him to a catapult in an effort to launch him off of their ship. Soon, the Vikings discover that they have hit a rock and that their boat will leak, which gives SpongeBob an idea. He then plugs up the boat with his porous appearance, and saves the Vikings, claiming the events to be "a Viking-sized adventure."
|( ‣ ) Production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
• SpongeBob Theme II - Nicolas Carr, Sage Guyton, Jeremy Wakefield [title card]
• Happy Sack Shanty - Michael Bolger, Nicolas Carr [opening]
• Accordian Fanfare - Michael Bolger, Nicolas Carr ["There's Regular, Large..."]
• French Horn Rips - Michael Bolger, Nicolas Carr ["...and the new Viking Size!"]
• Daily Chores Jig - Michael Bolger, Nicolas Carr ["But Mr. Krabs, these are all the same size."]
• Viking Horn - Nicolas Carr [cardboard Viking helmet]
• Daily Chores Jig - Michael Bolger, Nicolas Carr ["Don't you know when you're being ignored?"]
• What's This - Nicolas Carr [SpongeBob asks what a Viking is.]
• Daily Chores Jig - Michael Bolger, Nicolas Carr ["The Vikings lived a long time ago."]
‣ The Quest (A) - Robert Foster [Squidward teaching SpongeBob about the Vikings]
• Comedic Conversation - Nicolas Carr, Steve Marston ["Of course they do."]
‣ Hawaiian Happiness - Jon Jelmer [SpongeBob writing a letter to the Vikings]
‣ Hurry - Ludo Philipp [at the post office]
‣ Roman Empire - Larry Hochman [Viking garbageman]
‣ Celtic Lands - David Farnon [at the Viking lair]
‣ Big Bad Giant - Paddy Kingsland [garbageman enters]
‣ Celtic Lands - David Farnon ["Your Majesty, look! A letter!"]
‣ Gates of Troy - David Farnon [Viking ship arrives at Krusty Krab]
‣ Portents of War (a) - Robert Foster [SpongeBob and Squidward kidnapped]
• Lap Steel - Nicolas Carr ["Squidward?"]
• French Horn Rips - Michael Bolger, Nicolas Carr [shot of Viking ship]
‣ Big Bad Giant - Paddy Kingsland [Vikings introduce themselves]
• Vibe Q Sting - Nicolas Carr ["Like what?"]
• Boring Morning - Nicolas Carr, Steve Marston [shield toss]
‣ March to Conquest (a) - Roderick Skeaping, Robin James Jeffrey ["No, we don't!"]
‣ Big Bad Giant - Paddy Kingsland ["So tell me, what is it that you two know how to do?"]
• Skipping to School - Sage Guyton, Jeremy Wakefield [Squidward saying all the things he can do]
• Nude Sting - Nicolas Carr [Squidward assigned to bathroom attendant]
‣ Comic Walk - Sidney Torch ["Hold it right there, whiskers!"]
‣ March to Conquest (a) - Robin James Jeffrey, Roderick Skeaping [Squidward about to be catapulted off the ship]
‣ Entry of the Heroes A - Gregor F. Narholz ["You mean to question the will of the tribe?"]
‣ Rescue - Cecil Milner [ship hits an iceberg]
• Toy Piano - Nicolas Carr, Barry Anthony [security blanket]
‣ Attack - Anthony Hymas [SpongeBob saves the ship]
• Tentically Speaking - Sage Guyton, Jeremy Wakefield [ending]
- The episode is available on the Viking-Sized Adventures, Season 6 Volume 2, SpongeBob's Legendary Adventures, The Ultimate SpongeBob Box Set, SpongeBob SquarePants Vol. 9, Triple Pack 2, Kids Double Pack: Volume 7, Kids Double Pack: Volume 5, Complete Sixth Season, The SpongeBob SquarePants Collection, Time Travel, The SpongeBob SquarePants 8 Season DVD Collection, Big Hits: Volume 1, Next 100 Episodes, and The Best 200 Episodes Ever DVDs.
- This episode was nominated for an Emmy at the 2009 Primetime Emmy Award for Outstanding Special Class - Short-Format Animated Programs.
- "Dear Vikings" was ranked #61 during the SpongeBob's Top 100 event in the UK and Ireland from June 4-8, 2012.
- This episode was available on the iTunes store before it aired on Nickelodeon in the United States, and it was paired with "Ditchin'" for $1.99.
- This episode premiered during the 2008 Super Stuffed Nicksgiving Weekend.
- This episode breaks the fourth wall when the Vikings look at the viewers when saying, "Sock'n Garten."
- SpongeBob mentions the episode title when he reads the note out loud.
- SpongeBob's letter:
- Dear Vikings, I am writing to ask you guys about your lives and stuff. If you had take the time to answer all my neat questions, then that would be really swell.
- In the German dub, all the Vikings are called Olaf except Gordon, who is called Günther.
- List of facts about Vikings' way of life:
- Like to redecorate (demolish things)
- Do appropriate things (steal loot)
- Liberate (take hostages)
- Fun activities:
- Shield toss
- Flaming shield toss
- Cannot sing
- Use blankets for calming down
- This is the first episode to use the tracks "Happy Sack Shanty," "Attack," and "Daily Chores Jig."
- There are two online games based on this episode: Viking Hiking and Sockengarten Saga.
- During the History of SpongeBob Marathon, this episode was paired with "Spongicus."
- In Bahasa Indonesia version, the scene where SpongeBob is sending a letter to the Vikings and the green Olaf being launched off the ship with a catapult are cut due to time constraints.
- When SpongeBob says the cups are the same size, the regular size cup is slightly smaller.
- During the scene where SpongeBob says, "I'll let you know if I think of anything," his nose looks like Squidward's. When the camera switches then switches back to SpongeBob, his nose is normal again.
- When the ship hits the iceberg, the figurehead falls off, but later, it is still there.
- When Mr. Krabs explains who the Vikings are, SpongeBob has no side pores.