- SpongeBob SquarePants
- Squidward Tentacles (cameo)
- Mrs. Puff (cameo)
- Sheldon J. Plankton (cameo)
- Sandy Cheeks
- Patrick Star
- Tina Fran
- Cotton candy vendor (debut)
- Father and son
- Chocolate-eating scallops (debut)
- First balloon vendor
- Balloon buyer
- Vera Fishbowl
- Other patrons waiting to ride the Heart-A-Whirl
- Heart-A-Whirl operator
- Ferris wheel riders
- Abigail Marge
- Paco (cameo)
- Harold "Bill" Reginald
- Jennifer Millie
- Roller coaster riders
- Norma Rechid
- Dennis Rechid
- Medley Fishbowl
- Second balloon vendor
- Heart man
- Patrons on the Heart-a-Whirl
- Dale (debut)
- Ivy (debut)
- Miss Rechid (debut)
- Debbie Rechid (debut)
- Frank (debut)
- Monroe Timmy (debut)
- Frankie Billy
- Other patrons at the carnival
On Valentine's Day, SpongeBob gives out Valentine's Day hearts to everyone. He even gives one to Plankton, which is delivered with the help of tweezers.
Next, SpongeBob goes to Sandy's treedome, where Sandy gives him an acorn nut with an arrow stuck through it, which he puts away. SpongeBob then takes out his bottle of chocolate syrup and blows out a chocolate heart bubble for Sandy's valentine. SpongeBob and Sandy then talk about what they have arranged to give Patrick for his Valentine Present, a hot air balloon made out of chocolate and how for everything to be arranged.
SpongeBob tells Patrick (who has made his Valentine's present for SpongeBob by putting a big rock on the ground and pounds the rock into the shape of a heart, but smashes the rock into a pile of dirt thinking that SpongeBob is in there and then realizing that SpongeBob is behind him (said by SpongeBob) and give him a pile of dirt for his Valentine Present) that he has the best present ever ready for him.
Patrick gets very blithe and impatient for his surprise present and the two go to the Valentine's Day Carnival. Since it is a surprise present, Patrick starts to guess what is even to the point that he thinks it his present is a bunch of paramecium and to even the point that he thinks that his present is on top of Mount Climb-up-and-Fall-off, in which he runs up the mountain and falls off a couple times.
Meanwhile, Sandy, who is in route to the carnival in the chocolate balloon, is attacked by a flock of chocolate-eating scallops, which causes the balloon to veer off course as she fights them off. Due to the delay, Sandy tells SpongeBob to take Patrick to the Ferris wheel to keep up his overexcited mood.
SpongeBob starts to think that Patrick would not get his Valentine and doesn't want to break his heart so he takes him to the Ferris wheel to keep up his morale. When SpongeBob and Patrick reach the top of the Ferris wheel, they wait for the surprise to be revealed.
However, SpongeBob contacts Sandy via his walkie-talkie, she informs him of her troubles and since one of the scallops bit the balloon and the balloon is floating downwards that he will have to go with "Plan B." SpongeBob tells Patrick, who is so excited that he is literally shaken the entire Ferris wheel, that his present is a "friendly handshake."
That greatly disappoints him and after shaking SpongeBob hand, he stares at his own hand with a grumpy look on his face. SpongeBob laughs nervously and throughout their playtime in the carnival, SpongeBob laughs at the joys of the carnival whilst Patrick has the same grumpy look on his face.
When Patrick and SpongeBob are sitting down at a table, he has been thinking and thanks SpongeBob for the gift he gave him, but when he sees many other people thank SpongeBob for the gifts he gave them, including complete strangers (one man only asks for the time), he is pushed off the deep end and goes on a rampage.
He begins destroying the carnival and corners everyone there, including SpongeBob, seemingly with the intention of killing them all. Before he gets the chance, however, Sandy arrives, having tamed the scallops, who is now helping to keep her balloon afloat. SpongeBob tells him that his true Valentine Present is behind him, but Patrick thinks that isn't true. Even with the help of the crowd persuading him to turn around, he still refuses to turn around until Sandy says his name, in which he turns around seeing his great Valentine Present.
Upon seeing this, Patrick takes a bite of his present in amazement, causing it to pop and covering the carnival in chocolate. Smiling at SpongeBob and completely forgetting his anger, Patrick joyfully says, "Aww, SpongeBob, you didn't have to get me anything!" as the episode ends.
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ Pikanterie - Gerhard Trede [opening]
‣ The Mob - Sam Spence [SpongeBob explaining the plan]
‣ On the Beach - Kapono Beamer [Patrick making a Valentine out of a rock]
‣ The Main Event - Gregor F. Narholz [Patrick excited about SpongeBob's gift]
‣ On the Beach - Kapono Beamer [Patrick begs SpongeBob to tell him what the gift is]
‣ The Alpine Waltz - Dick Stephen Walter [Valentine's Day carnival]
‣ Flight in Panic 1 - Gregor F. Narholz [Chocolate-eating scallops appears]
‣ Gator - Steve Belfer [Patrick trying to guess what the gift is]
‣ Death Trap - Gregor F. Narholz [Scallops attacking the balloon]
‣ Hawaiian Link (a) - Richard Myhill [Ferris wheel]
‣ Vibe Link (b) - Richard Myhill [SpongeBob is nervous]
‣ Death Trap - Gregor F. Narholz [Sandy fighting scallops]
‣ Night Butcher - Richard A. Harvey [Patrick is impatient]
‣ Hawaiian Link (b) - Richard Myhill [Friendly handshake]
‣ Pikanterie - Gerhard Trede [carnival montage]
‣ Stack of Leis - Kapono Beamer [Later.../"And even though I was expecting more..."/"And not that it matters that we've been friends for so long..."/"So, as I was saying..."]
‣ House of Horror - W. Merrick Farran [Patrick snaps/Patrick gets more crazy]
‣ Lovely Scenery C - Mladen Franko ["I know I deserve this, but do they?"]
‣ Dangerous A - Mladen Franko [Patrick closing in on SpongeBob]
‣ Western Panorama - Len Beadle [Sandy arrives]
‣ Gator - Steve Belfer [Everyone telling Patrick to turn around]
‣ Hawaiian Holiday - Kapono Beamer [Patrick bites into the balloon]
‣ Moloka'i Nui A - Kapono Beamer [Ending]
- This episode is available on the Tales from the Deep, Complete 1st Season, First 100 Episodes, and Fools in April DVDs.
- As of February 1, 2019, The Internet Movie Database (IMDB) gives this episode a rating of 8.6/10 based on 473 ratings by users. TV.com users give this episode a rating of 9.0/10 based on 203 votes.
- "Valentine's Day" was ranked #8 during The Ultimate SpongeBob SpongeBash event on July 17–19, 2009.
- This episode is #2 on Tom Kenny's Top 20 on iTunes. His description says:
"The first great Patrick episode! I love how Patrick instantly goes from having his feelings hurt to an Incredible Hulk-like rage. Bill Fagerbakke really came into his own in this one."
- This episode is the first one to be produced in 2000.
- This episode was also the first one to be produced in the 2000s decade.
- This episode and "The Paper" only tend to air in reruns in the United States on or around Valentine's Day, making this and "The Paper" extremely rare and difficult to watch on TV, since they both aired on Valentine's Day and are a Valentine's Day special.
- The same thing occurs with "Scaredy Pants," and "I Was a Teenage Gary," as they are Halloween specials, "Fools in April," and "Neptune's Spatula," being April Fool specials, and lastly with "Christmas Who," and "It's a SpongeBob Christmas!," being rare episodes to see, with them being Christmas specials.
- There is an online game based on this episode called Love Hurts!.
- There is also a chapter book based on this episode called The World's Greatest Valentine.
- This is first episode where a micro-organism excluding Plankton is shown in the SpongeBob SquarePants series.
- This episode premiered in Canada on February 14, 2001, exactly one year after its USA premiere. Its sister episode, "The Paper," premiered in Canada before this episode on November 18, 2000.
- This episode is one of four episodes in the first season to use the Crowd Scream sound effect, the others being "Scaredy Pants," "Sleepy Time," and "Suds" respectively.
- In the Dutch version of this episode, when the guy asks Patrick for the time, Patrick actually tells him the time (3:15 PM) instead of saying "Patrick needs love, too!"
- Patrick's unique quotes, including "Heart on stick must die!" and “I defy you, heartman!" have become rather memorable memes.
- Patrick wears a shirt at the beginning of the episode, but in "Rock-a-Bye Bivalve" SpongeBob says Patrick never wears a shirt, suggesting this takes place after such.
- When Patrick throws the last male fish that was about to thank SpongeBob for his gift and Patrick becomes crazy, he bangs his stomach and acts like Kerchak from the Disney movie Tarzan, and the Marvel character The Incredible Hulk in both rage and speech pattern.
- When SpongeBob and Patrick are on the Ferris wheel, SpongeBob's shoes look like heels.
- When one of the scallops pop a hole in the balloon for the first time, air is coming out, but when Patrick pops it again, chocolate sauce explodes out of it.
- When Sandy opens her helmet to receive the chocolate bubble, no water comes inside her helmet, even though they are underwater.
- In the original scenes with the "Valentine's Day Carnival" sign, Mount Climb-up-and-Fall-off is not seen, but when Patrick mentions it, it can be seen.
- When Sandy is on the chocolate balloon, her suit seems to be smaller.
- When Sandy fights the chocolate-eating scallops, the balloon's basket seems to be missing, only showing the string attached to it.
- The rides at the carnival change place throughout the episode. For example, the Heart-A-Whirl is to the right of the Ferris wheel at the beginning of the episode, but at the end when everyone is on the pier, the rides are still in the position it was at the beginning of the episode, even tough the pier is on the other side.