The setting is Madrid, Spain in the 1950s, with landmarks like Edificio España in view in the opening landscape.
The camera slowly pans to the right and reveals a Spanish house, and goes inside to the sound of a flamenco guitar. As the camera reveals that Lightning is playing the guitar while leaning against a couch, Jerry, who here is called "El Magnífico", comes dancing out of his hole and then brings back a small wedge of cheese. Meanwhile, the Spanish owner of the house, referred to as the Señorita, comes in the room, sees Jerry, and taps her foot impatiently at Lightning. In Spanish, Lightning complements the señorita about her good looks today, until he finally agrees to chase Jerry. He dives at the mouse eating his cheese on the carpet, and Jerry strategically raises the carpet and himself such that the cat goes underneath the carpet and runs into a table. Lightning is unfazed and returns the other way, but the mouse ties his tail to another table and is drawn back into it, and then smashed by the top of the table. Lightning's legs, tail, and head pop out akin to a turtle.
Now, the cat dives at the mouse next to his El Magnífico hole, and he lifts himself out of the way again, leaving the cat to pitch and jump directly into his guitar where he left it, on the couch. Jerry, having defeated Lightning, dances back into his hole. The poor cat, head poking through his guitar, proclaims it is no use. The señorita responds by saying that is because he is lazy - the laziest cat, in fact, that she has ever seen! Lightning is hurt, and responds that nobody could catch "El Magnífico". Therefore, she commands him to read a telegram which says "Arriving today from U.S.A., Guarantee to catch mouse (El Magnífico)....Tom, Olympic, U.S. and World Champion Mouse Catcher."
Tom Cat arrives at the door with numerous medals and trophies beside him. The cat, being from America, uses a guide book to help him speak Spanish. He tells the señorita: "How are you, ma'am?" in Spanish, obviously struggling with the language, particularly on the "señorita". However, she waves this off as good manners, and then leaves, reaffirming Tom's guarantee to catch the mouse. They bid goodbye in Spanish (Tom still speaking poorly), and the señorita then snubs Lightning in comparison to Tom before leaving. Lightning makes a loud noise to startle Tom, and chants "El Magnificoooooooooooooo..." as Jerry enters inside his hole with a banana.
In a highly efficient fashion, Tom uses a stethoscope to detect Jerry in the wall, marks the spot with an X, drills a hole in the spot, and then pulls the mouse out with a fireplace blower,stuffs Jerry into a small cannon, lights it, and holds the main door open until Jerry is fired out of the house. Right when Tom thinks the job is finished, Jerry pops right back in via a small door panel at the bottom of the door. Tom kicks him out, and Jerry comes back in a second time through one of the higher panels, which falls on Tom's head. Jerry does a different dance this time, making sure to step on the board repeatedly. As Jerry is coming close to the El Magnífico hole, Tom begins to flamenco along with him and around the room. However, the tables are turned when Jerry directs the dance to a nearby window, which Tom falls through and out of, then down into a fountain. Tom is now incensed.
The camera cuts to the front door and Tom shunting the door out of the way. He stops next to Lightning and begins to transform into a bull as bullfight music plays. Lightning is instantly ramped up, and begins to play a guitar tune along with the music as El Magnífico comes out in a matador garb.
Tom makes a beeline for the mouse and misses as Jerry eggs him on by saying "Haha!, Toro!, C'mon!" The cat runs at him again, and Jerry, blindfolded, jumps in the air and the red cape swirls like a tutu in the air. The camera cuts to Lightning cheering "¡Ole!" with progressively higher emotion, until he sees Tom crash into a table and a small piece of pottery cracks over his head. So Jerry opens Tom's eye and waves the red cape in it, causing both eyes to spin (or have spirals in them) and the cat to wake up. Tom lunges, but he misses a third time and slides into Jerry's mouse hole, taking the mouse along on top of him.
Jerry revives the "bull" by smacking him in his rear with the cape. Now, the cat is angry, but the fourth lunge leads to the cat simply disappearing into the cape as Jerry holds it out. After showing there is nothing on either side of it, Jerry hurls Tom out of the cape, and then plays guitar on Tom's whiskers. This gets the cat to continue the chase, and he turns in all directions to attempt to corner the mouse against the wall. However, Jerry escapes this and makes circles around the floor, causing Tom to wrap himself up in a pretzel shape. The camera now cuts to Jerry victoriously carrying his matador hat as Lightning and a recorded clip of a Spanish crowd acclaim "¡Ole!".
The señorita returns to find both Lightning and Tom playing guitar, and demands to know what is going on. Lightning responds, "Señorita, I told you: No one, but no one can catch El Magnífico!" and asks Tom if this was true in Spanish. Tom says that it was true (this time in fluent Spanish) and continues guitar playing. The señorita sees Jerry pulling a banana, a cherry and an orange into his hole.
The name of the short is a play on the Spanish phrase "Mucho más" (Much more).
This is the only CinemaScope Tom and Jerry cartoon that was pan-and-scanned more properly, as many of the pan-and-scanned CinemaScope Tom and Jerry cartoons tend to be poorly-framed with more out-of-focus shots where important visual elements (such as the characters) often get cropped off the shots.
An animation cel from this short.
Mucho Mouse is a role-reversed version of "Old Rockin' Chair Tom"; as Mammy Two-Shoes brings Lightning in to help catch Jerry for her, in that episode; thinking Lightning will bring more success than Tom, but both cats fail. In this episode, The señorita brings Tom to catch Jerry in place of Lightning, and both fail; though in the earlier episode, Tom and Jerry paired up; in this episode both cats went against Jerry.
It is also, in a way, similar to "Trap Happy" with the roles reversed as well, since in that cartoon Tom fails in his attempts to catch Jerry so Butch came in to help him, while in this episode Lightning fails in his attempts to catch Jerry so Tom came in to help him. Co-incidentally, both cartoons end with both cats failing to catch Jerry.
This episode marks Lightning Cat's last appearance for the Hanna-Barbera era; he would later appear in the Chuck Jones era.
Unlike the other cartoons, Joan, as the señorita, speaks with a Spanish accent as opposed to an American accent.
This is another rare instance of both Tom and Jerry actually speaking instead of staying silent in a short; both speak some English and Spanish in this episode.
This is also a rare moment where an animal character talks directly to a human character, as Lightning and the señorita have a conversation and she seems to fully understand him in this short, as well as Tom later greeting her in Spanish.
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