We are Siamese if you please. We are Siamese if you don't please.
~ Si and Am
Si and Am are supporting antagonists in Disney's 15th full-length animated feature film Lady and the Tramp (which is based on Happy Dan, The Cynical Dog by the late Ward Greene), and its 2001 sequel Lady and the Tramp II: Scamp's Adventure.
They are a mischievous pair of twin Siamese cats who seek to cause trouble, eat others' food, and incriminate Lady.
In the original film, they were both voiced by the late Peggy Lee in her first and only villainous Disney role. In the sequel, Si was voiced by the late Mary Kay Bergman, and Am was voiced by Tress MacNeille. In House of Mouse and Mickey's House of Villains, they were both voiced by Tress MacNeille (after Mary Kay Bergman's death).
Si and Am first appeared when their owner, Aunt Sarah, comes to babysit the Brown's new baby. The two emerge from the picnic basket Sarah carried them in, introducing themselves to Lady, then immediately roaming the house, claiming that they might "stay for quite a while". They begin destroying the house, tearing up curtains and wrecking furniture. They try to eat the family fish and bird, but Lady comes in to scare them off.
The two then hear the baby crying upstairs, and decide to go and steal some of the baby's milk. Lady, not wanting this to happen, chases them off, causing some destruction. Sarah comes down and investigates, and the two cats fake injury. Sarah pities them and carries them upstairs, while blaming the whole affair on Lady and muzzling her.
Lady and the Tramp II: Scamp's Adventure
Si and Am appear briefly in the 2001 direct-to-video sequel, where Sarah again carries them around in the picnic basket. Lady and Tramp's son Scamp wishes that he was braver, so that he could take on threats such as them.
Later, they are shown at a picnic with Sarah, where they attempt to steal a turkey. However, Scamp rushes by and scares them away. The cats are even more terrified when Buster and his gang of stray dogs (among them Scamp) arrive to disrupt the picnic.
Si and Am are really mischievous and crafty. They are able to dupe their owner, Aunt Sarah, and cause an equivocal situation to Lady. They have both hunting skills and predatory instincts, as they try to eat the family's fish and canary. They make fun of the collateral damage they cause on furniture and decoration. Sinister and cunning, they take advantage of Aunt Sarah doting to hide the truth and have Lady condemned for them.
House of Mouse
Si and Am make several cameo appearances throughout the show, most notably in the episode "Rent Day", where they appear to be rooting and friendly with the Aristocats heroes O'Malley and the Alley Cats.
Mickey's House of Villains
Si and Am also appear in the 2002 direct-to-video film Mickey's House of Villains. They participate in the villains' takeover of the House of Mouse, and later watch the final showdown between Mickey Mouse and Jafar. When Jafar is defeated, they flee with the rest of the villains.
They also appeared in the film's trailer.
In Fantasmic!, Si and Am appear in the musical bubble sequence.
Si and Am appear in a fair amount of Disney Villains merchandise. They also have a statue of them in the Disney Villains Store at Disney's Hollywood Studios.
In 2017, Si and Am were among the Disney villains projected onto Sleeping Beauty Castle at Hong Kong Disneyland as some of Maleficent's invited guests in Villains Night Out!.
Si and Am appear commonly in both Lady and the Tramp and Disney Villains merchandise.
Their song, "The Siamese Cat Song", was featured on the Disney Villains: Simply Sinister Songs album.
Their original names during writing were Nip and Tuck.
With their names combined, "Siam" is the former name of the Kingdom of Thailand, referencing the cats' heritage and the name of the country.
They were controversial to some, being cited as offensive Asian stereotypes.
In early drafts of the film, Si and Am were supposed to go up against the rat, and be defeated.
Despite their small roles, Si and Am are some of the most popular characters in the film.
Si and Am are members of Disney's Sinister Cats, a sub-franchise of the mainline Disney Villains franchise.