The Radcliffe family and their Dalmatians are preparing to move their "Dalmatian Plantation" out in the countryside, but Patch feels ignored amongst his 98 siblings. After being accidentally left behind on moving day, Patch decides to visit his TV hero Thunderbolt, who has just been told that he is set to be killed off in the next episode. Desperate to stay on the show, Thunderbolt decides to pull some real life heroics and recruits Patch's help due to his knowledge of his feats on the show. However when Cruella de Vil plans to steal the Dalmatian puppies again, Patch and Thunderbolt must become real heroes and save the day.
This film provides examples of:
- Ascended Extra: Patch and Thunderbolt, a background and a one-scene character respectively in the first film, are now primary characters in the sequel.
- Becoming the Mask: Thunderbolt. At first, he just wants to use Patch's fanboy knowledge of his show to get some press but ends up becoming genuine friends with the pup and helps him rescue his family.
- Big-Bad Ensemble: Cruella and Lil' Lightning are both antagonists, but they have different agendas: the former wants to steal the Dalmatian puppies again, the latter wants to take Thunderbolt's place as star of the show. They actually never interact, even though their actions are indirectly helping the other.
- Big Damn Heroes: Played with when Thunderbolt arrives to save the puppies.Thunderbolt: I always arrive in the nick of time...(whispering to Patch) Hey, I may not be a real hero, but I can act like one. I'll distract them.
- Brick Joke: The Newspaper headliner of Patch at the Thunderbolt audition. The Ratcliffe's fetch the paper, but Roger is too distracted by his piano to read the headliner and he tosses the paper aside. It's only after he looks at the paper does the family realize Patch is in London and not at the plantation with them. See also Nice Job Breaking It, Hero! for more.
- Demoted to Extra: In a similar vein to the TV series, Pongo and Perdita are largely secondary characters with their puppy Patch taking the foreground.
- Dinky Drivers: The Dalmatian Puppies do this to a London double-decker bus at the climax of the movie.
- Disney Death: Thunderbolt initially thinks that this is what Lightning means when he tells him that his character will die in the next episode, before learning that he's being Killed Off for Real and being replaced with a new dog (which is all a lie of course.)
- Evil-Detecting Dog: The first sign that Lars isn't truly evil is the fact the puppies like him.
- Evil Twin: Thunderbolt tells Lil' Lightning he'd like to have one in one of his adventures.
- Exact Words: When Lars finds out what Cruella and her henchmen want to do with the puppies, he declares nobody will harm them for as long as he has something to say about it. The next scene features him bound and gagged.
- False Friend: Lil' Lightning the Welsh Corgi. He informs Thunderbolt that his character is being killed off the show, when in fact, soon revealed to be a lie just to trick Thunderbolt into getting out of the picture in order so Lightning can have the spotlight for himself having grown tired of being in Thunderbolt's shadow.
- Then upon hearing about Thunderbolt still gaining fame while on a real heroic mission, Lil' Lightning then decides to join forces with him, along with the pup, obviously just to stop them from succeeding as to prevent Thunderbolt from reclaiming the spotlight. Once they reach the bad guys' hideout, Lightning persuades them to go for an open attack to rescue the puppies instead of a stealth plan, which of course fails and gets Patch and Thunderbolt locked up in cages along with the other puppies. He even reveals to them his true nature and intentions before leaving them behind in their cages.
- Freudian Excuse: Thunderbolt isn't very nice towards Lil' Lightning, which can explain why Lil' Lightning ends up resenting him.
- Glad I Thought of It: When Lil' Lightning tells Thunderbolt that he's getting replaced and Thunderbolt panics, we get this exchange between them:Lil' Lightning: Well, I did have this one crazy thought... What if you went out and did something heroic, like you do on the show, but in the real world? You know, get your name on the paper! Prove to them that you still got it!
Thunderbolt: Wait a minute. What if... I went out and did something heroic in the real world?
Lil' Lightning: Or that could work too.
- Group Picture Ending: The movie ends as Patch, Thunderbolt and the Dalmatians get their picture taken for the newspaper.
- Intergenerational Friendship: Patch and Thunderbolt.
- Just Following Orders: Horace and Jasper's excuse. They claim Cruella forced them to do her bidding.
- Karma Houdini: Jasper and Horace. Not only do they SOMEHOW escape the police that are seen arresting them at the film's end, but they also become artists themselves, selling sundresses. But this is only seen during the film's end credits. It can be explained because they only followed orders from Cruella and stood up for themselves at the end. In short, they were pardoned by the police for testifying against Cruella.
- Long Title: Let's turn all the numbers into words here; it's One Hundred and One Dalmatians Two: Patch's London Adventure. That's nine words in sixteen syllables. Of course, they couldn't use 102 Dalmatians for certain reasons.
- Never Going Back to Prison: Inverted - after some slapstick-filled hijinks involving Nanny and the pigs on the farm, Horace asks Jasper, "Can we go back to jail now?" in a similar tone to a kid asking to go home.
- Nice Character, Mean Actor: Lil' Lightning. He is portrayed as the serious and tough sidekick on TV, but the real Lightning is jealous of Thunderbolt for always taking the spotlight.
- Nice Job Breaking It, Hero!: Patch appearing as the lucky dog in the front page headline photo at the Thunderbolt audition unfortunately ends up biting him, as reading the Ratcliffe's new address on his collar from the photo allows Cruella De Vil to know where Anita and Roger moved to and steal the puppies again. She even sadistically thanks him when he appears at her warehouse to rescue the other puppies.Cruella: Well, well, well. What do we have here? Oh, it's you! (chuckles) I owe you a debt of gratitude, my photogenic little friend. If it wasn't for you, I'd have never found your brothers and sisters! And now I have you all! (cackles evilly)
- One Head Taller: Cruella with Lars. Gender reversed from the usual form of this trope and avoiding stereotypes associated with taller woman shorter man pairings, actually!
- Remake Cameo: An In-Universe example. When Lil' Lightning tells Thunderbolt that the writers plan to kill him off, he adds that Thunderbolt's not even going to get a cameo in the remake.
- Rhetorical Question Blunder: When Lars learns Cruella wants to turn the puppies into canvases for his art work, he asks her and her henchmen how they can do something like that. Each bad guy gives a suggestion.Jasper: Poison 'em.
Horace: Drown 'em.
Cruella: Bash them in the head!
- Sanity Slippage: By the film's end, Cruella's obsession with getting the puppies has driven her completely insane to where she starts literally seeing spots everywhere, and she is promptly committed to a mental institute.
- Scared of What's Behind You: Thunderbolt barks loudly at Jasper and Horace and they shriek in alarm. Thunderbolt thinks he got Horace and Jasper right at his mercy as "villains always cringe in fear whenever Thunderbolt is here." Well, not in this case, as the Baduns actually screamed because Cruella is standing right behind Thunderbolt, holding a paint can. She whacks Thunderbolt on the head with the paint can, and the German Shepherd falls to the floor, unconscious.
- Suddenly Always Knew That: Thunderbolt uses his dramatic death scene to distract Cruella and her lackeys while the puppies get away.
- Taught by Television: Patch has every episode of "Thunderbolt" memorized and uses the show's plots to first help Thunderbolt do "big hero stuff" and then to rescue his family.
- Think Nothing of It: After the puppies are safe and sound, Pongo thanks Thunderbolt for saving his family, to which he responds "Oh, don't thank me. Thank your son. He's the real hero."
- Villainous Breakdown: A minor one at the end, as Lil' Lightning is led away by a pair of police dogs, dramatically begging to try to get the dogs to let him go on the claim he was trying to help Thunderbolt, but they don't buy it for one second.
- "Where Are They Now?" Epilogue: As the credits roll, they are intercut with different tabloid and newspaper articles showing the fates of various major characters. These include Roger winning an award for his new song, "Seeing Spots", Jasper and Horace opening up a store and starting a line of sundresses, Cruella committed to a mental institute, and even Lars being hailed as a genius for a piece of art that was accidentally created by Patch who splattered paint on the canvas when Jasper and Horace were on it, leaving their silhouettes surrounding by a splash of colors.