- SpongeBob SquarePants
- Gary the Snail
- Jellyfish (mentioned)
- News reporter (cameo)
- Eugene H. Krabs
- Charlie (cameo)
- Clay (cameo)
- Harv (cameo)
- Two customers
- Sandy Cheeks
- Jackrabbit (mentioned)
- Patrick Star
- Wild Scallops
- Purple Doctorfish
- Hans (in-series debut)
- Tom Kenny (cameo)
The episode starts with SpongeBob asleep and having a dream about Krabby Patties. He awakens hungry with his stomach growling and makes a Sea-Nut Butter and jellyfish jelly sandwich as a midnight snack. However, he falls asleep after the first bite, leaving the refrigerator open all night and freezing the entire house. By morning he develops the suds, a sponge-exclusive sickness similar to a cold or influenza and has bubbles come out of him whenever he sneezes. Gary suggests he stay home, but SpongeBob denies being sick and goes to work anyway. At work he has a hard time doing his job, and when Mr. Krabs comes in to tell him off, Gary reveals that SpongeBob has the suds. Mr. Krabs then orders him to return home and get some rest, saying that he can't have him sneezing all over the food. This causes the customers to panic and run out of the Krusty Krab.
Once home, SpongeBob realizes he needs help, so he calls upon Sandy to take him to the doctor. She agrees, saying that she will be there "faster than a barefoot jackrabbit on a hot greasy griddle in the middle of August...". SpongeBob cuts her off and thanks her. SpongeBob then dresses warmly in anticipation of going to the doctor but is visited by Patrick, who thinks he is going skiing. SpongeBob explains that he is sick and going to the doctor.
Patrick warns him that the doctor's office is "a horrible, horrible place" where they make you sit in the waiting room and read old magazines. SpongeBob, horrified, asks Patrick to be his doctor instead. "Doctor" Patrick begins to practice on him, starting by plugging up all of SpongeBob's holes so bubbles won't come out. However, this causes SpongeBob to inflate every time he sneezes. SpongeBob thinks it's good enough (but it's really making his suds worse). He then asks Patrick to call Sandy and tell her not to come. He does so, but Sandy doesn't buy it and continues coming. Patrick then tells SpongeBob to hurry up or else Sandy will take him to the doctor. He tries several things to cure SpongeBob's suds, including turning his foot into a sandwich, yanking a tooth, bouncing on him like a trampoline, repeatedly placing and removing a large band-aid and even putting him in a medieval torture device, by which time Sandy has arrived. SpongeBob sneezes one more time (this time turning him into a perfectly round ball). Sandy demands Patrick open the door, but Patrick rolls SpongeBob out the back door and disguises him as a duplicate of his house. Sandy questions Patrick as to why he has two houses. Patrick replies that he has too much stuff for one. She then questions why his house has feet, Patrick responding that it is his "mobile home." SpongeBob then sneezes again, revealing himself. Sandy says that he has to see a real doctor, but Patrick refuses, telling SpongeBob to "say "ahh," but, when he does so, his breath destroys nature. Sandy takes this as proof that SpongeBob needs to go to a doctor. They then squabble over SpongeBob and accidentally fling him into the air. Patrick asserts that everything was fine before Sandy arrived; Sandy retorts that he should be arrested for impersonating a doctor. SpongeBob, meanwhile, bounces away and, at the last second, comes to a stop in front of the Krusty Krab; then, the pressure from his plugged-up holes becomes too much, and he sneezes violently and destroys the Krusty Krab. Sandy then takes SpongeBob to a real doctor, who prescribes the "sponge treatment," which is performed by a live human hand named Hans. This involves being rinsed with soap and used to scrub various objects and people. The treatment cures SpongeBob completely, and he even receives a lollipop. SpongeBob exclaims that he loves the doctor.
Wanting a lollipop, Patrick claims that he has the suds, too, after blowing a bubble to prove it. The doctor assures him that a "special treatment" awaits "Doctor" Patrick. Hans returns, puts soap on Patrick, and uses him to clean a cactus and then a toilet. The episode ends with Patrick crying out, "Wait, this doesn't seem right!"
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ Sugar Plum Fairy 59 - Richard A. Harvey [title card]
‣ Kamakani (b) - Kapono Beamer [opening]
‣ Merlins Hill - Jennifer Jones [SpongeBob's dream]
‣ Vibe Link (b) - Richard Myhill [SpongeBob wakes up]
‣ Hawaiian Holiday - Kapono Beamer [midnight snack]
‣ Footsteps of Horror - W. Merrick Farran [SpongeBob left the fridge open]
‣ Sugar Plum Fairy 59 - Richard A. Harvey [the house is frozen]
‣ Stack of Leis - Kapono Beamer [SpongeBob's sick]
‣ Botany Bay (b) - Robert Alexander White [at the Krusty Krab]
‣ Tales from the Swamp (a) - Ron Goodwin [customers panic]
‣ Hawaiian Link (a) - Richard Myhill [SpongeBob at home]
‣ Grass Skirts Blowing - Jan Rap [SpongeBob calls Sandy]
‣ Footsteps of Horror - W. Merrick Farran [Patrick tells scary story about doctor]
‣ Whisper from the Past [#64.02] - Gregor F. Narholz ["You gotta help me get better, Patrick."]
‣ Me for You - George Callert [plugging SpongeBob's pores]
‣ War Blowers - The Blue Hawaiians [treatment montage]
‣ Monks (a) - Dave Hewson [SpongeBob tied to rack]
‣ Gator - Steve Belfer [SpongeBob disguised as Patrick's house]
‣ Grass Skirt Chase - Sage Guyton, Jeremy Wakefield [Sandy tries to take SpongeBob to the doctor]
‣ On Fire - Gregor F. Narholz [SpongeBob rolling toward Krusty Krab]
‣ Hawaiian Link (b) - Richard Myhill [after SpongeBob sneezes]
‣ Good Bye Samba (a) - Ben Nabor [Sponge treatment]
‣ Pepito from Tampico (a) - Ronald Sekura, Otto Sieben [ending with Patrick's "treatment"]
- As of January 16, 2017, The Internet Movie Database (IMDB) gives this episode a rating of 8.8/10 based on 310 ratings by users. TV.com users give this episode a rating of 8.9/10 based on 210 votes.
- In fan-voted SpongeBob SquarePants marathons, "Suds" was ranked #61 during the Best Day Ever event on November 9–10, 2006 and #10 during The Ultimate SpongeBob SpongeBash event on July 17–19, 2009.
- Suds is a parody of the common cold/flu.
- There are four green bamboo sticks on the title card.
- This is the only episode where Sandy threatens to have Patrick arrested for impersonation of a doctor, and she was actually right. It's illegal to impersonate a doctor as it requires doctor's insurance and a college bachelor's degree as well. However Patrick impersonates a doctor again in "The Splinter" and gets away with it.
- According to an interview in an issue of Nickelodeon Magazine, SpongeBob's voice actor, Tom Kenny, was very sick at the time of recording the lines for this episode.
- SpongeBob mentions the suds again in "Whelk Attack," meaning this episode takes place before that episode.
- MY LEG!: Everyone running panicked in the Krusty Krab when they thought SpongeBob sneezed on their food.
- Here is a list of Patrick's unsuccessful attempts to make SpongeBob better.
- Plugging his holes with corks (which caused him to inflate).
- Putting SpongeBob's feet on peanut butter and bread.
- Tying one of SpongeBob's teeth to the door, then slamming the door.
- Jumping on him.
- Putting a massive bandage on his back then ripping it off when SpongeBob said "No" and then puts it back on in a different position.
- Putting him in what looks like a medieval torture device.
- Running Gag: When SpongeBob sneezes, bubbles come out of his holes. When SpongeBob sneezes with the corks on him, he inflates.
- When Patrick puts on gloves and covers them in water he says "Don't touch me! I'm Sterile!" Sterile means "hotword" from living germs or microorganisms.
- SpongeBob sneezes 19 times in the episode.
- SpongeBob's treatment involved washing a man, a foot, dishes, a car and the floor.
- Patrick's painful treatment included washing a cactus and a toilet.
- This is the first time a character in SpongeBob SquarePants impersonates a doctor. SpongeBob impersonated a doctor in "Dying for Pie" and "Suction Cup Symphony," and so did Plankton in "Fear of a Krabby Patty." Patrick also impersonated a doctor again in "The Splinter."
- This is the second episode to use an inverted image. In this episode, it occurred when the lightning went off in SpongeBob's dream. The first episode to use it was "Culture Shock," when the flash cameras went off at the end of the episode.
- An image from the part where Patrick says, "Don't touch me, I'm sterile." is featured on the protective case of The SpongeBob SquarePants Experience: A Deep Dive into the World of Bikini Bottom.
- Squidward, who should have been working at the Krusty Krab, is absent in this episode.
- This marks the first time that the Krusty Krab is in an episode to not feature Squidward.
- Despite premiering in 2000, this episode is copyrighted in 1999. The same applies with its sister episode ("Sleepy Time").
- The man who was in the shower during SpongeBob's treatment is Tom Kenny, SpongeBob's voice actor.
- In the Croatian dub, the episode name is "Zapjenio se", translating to "Foamed."
- In the Japanese dub, the episode name is "Kazehiki SpongeBob," translating to "SpongeBob Catches a Cold."
- In the Azerbaijani voiceover, the episode name is "Köpük xəstəliyi", translating to "Foam Disease."
- In the Serbian dub, the episode is called Веома болесно (Veoma Bolesno) translating to “Very Sick”.
- Before SpongeBob's sneeze destroyed the Krusty Krab, the five maritime flags are missing from the Krusty Krab and a flower was on the left-hand side of the Krusty Krab, but after he sneezed the flags mysteriously reappear amongst the wreckage of the destroyed restaurant and the flower is gone.
- As the inflated SpongeBob ball begins to roll down the hill, you can see it leads straight for downtown Bikini Bottom. Then, it heads for the Krusty Krab somehow.
- In the shot when Patrick's "mobile home" is shown, SpongeBob's house is gone.
- When SpongeBob comes rolling down and comes crashing into the Krusty Krab, the Chum Bucket was not there. The Chum Bucket was not there for the whole episode either.
- It's unknown how the doctor knew Patrick was impersonating a doctor. This can be assumed when the doctor calls him "Doctor Patrick."