Because Spanish is widely spoken, please indicate the country of dubbing (if known). For reference, eldoblaje.com (Spain) and doblaje.wikia.com (Latin America) are preferred, as the Spanish Wikipedia has limited info on that language's voice actors.
Ben 10 Alien Force: (Spain) Kimiko has become Danny Phantom. Danny now fights together with said cousin; and his former enemy, Samwise, against the forces of evil.
''Ben 10: Ultimate Alien: (Mexico) Ichigo reveals Scaredy's secret to the world, making him into a celebrity to children and a villain to adults. Scaredy has to overcome this to save the world.
''Bonkers: (Los Angeles) George McFly loses his job as Wackytoon Studios' biggest cartoon star and becomes a cop. He is partnered with Megatron.
(Spain) Howl loses his job as the top cartoon character at a movie studio. He then becomes a cop and is paired with Bunsen, then later with Charlotte York.
(Spain) Inu Yasha is a monkey attending Camp Kidney, which is run by Data.
Captain Planet and the Planeteers: (Spain) Five teenagers are given special rings. From Africa, Superman ('48 series, re-dubbed) with the power of earth. From North America, Doug with the power of fire. From the Soviet Union/Eastern Europe, Sarah Sanderson with the power of wind. And from South America, Son Gohan with the power of heart. With the five powers combined they summon earth's greatest champion - Principal Pixiefrog!
Chowder: (Mexico) A young boy named Jess Aarons becomes the apprentice of Chef Cow, along with his wife Mei. Cow's business rival is Frau Farbissina, who's apprentice, Rose Crisp, has a massive crush on Jess. Jess is also friends with Van Kleiss.
Danny Phantom: (Spain) Mikey is a ghost powered superhero. His best friends Marceline and Reptil help him out along the way. His parents Miroku and Katie are ghost hunters, while his sister Mrs. Liebhart just wants to be a normal person. He is also taught by Shnitzel.
Doug: (Latin America, Disney) Tino is a shy but sweet young boy who lives in Bluffington. His best friends are Ichigo and Sailor Mercury (whom Tino has a crush on). He is constantly bullied by Shrek. The town founder's ancestor's daughter, Lola Bunny, is also friends with him.
(Mexico, Nick) Brighton is a shy but sweet young boy who lives in Bluffington. His best friends are Joey Wheeler and Sailor Moon (whom Brighton has a crush on). He is constantly bullied by Numbuh 4. The town founder's ancestor's daughter, Fiona, is also friends with him.
The Fairly OddParents: (Spain) Littlefoot is a buck-toothed kid who is ignored by his parents Jeremy and Princess Peach and abused by an evil, ill-tempered teenager named Yumi. He gets through the day by making wishes to his fairy godparents, Mickey Mouse and Trixie, though they do not always work out as he hoped. Lotso, Littlefoot's teacher, frequently tries to capture the fairies, and Yumi's little sister Riley Daring is crushing on Littlefoot. He also likes to hang out with his friends Tricia Takanawa and Daxter, and is frequently visited by a muscular fairy named David Wallace.
Franklin: (Spain) Sonic is a young turtle (the irony!) who attends school with animals such as a fox named Agent K, a bear named Brock, a rabbit named Gir, and a beaver named Mandy. Sonic's mom is Dot Matrix.
(Mexico) After Steele loses a game of limbo to Ash Ketchum (later Arthur 2.0) and Elle Woods, he is contractually bound to be their servant / best friend.
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Hey Arnold!: (Mexico) Simba is a sweet little boy living in the city. His best friend is Ash Ketchum, and he's contstantly bullied by June, who has a crush on him. June's best friend is Patti Mayonnaise.
Kappa Mikey: (Spain) Zoro is a struggling American actor who moves to Japan to star in a TV show produced by Kwame. Some of his costars include Emma, Azula, Duckman, and Cupid.
The Replacements: (Spain) Eliza Thornberry and Lor are red-haired siblings who, if they're having a problem with a certain person in their lives, call their uncle Archie Morris and have him send a new adult to replace the problem-causing person, though it doesn't always work out. Eliza and Lily live with their adoptive parents, a daredevil named Courage the Cowardly Dog and a secret agent named Max, who drives a talking car named Jonah Hex.
Thundercats 2011: (Spain) After his home kingdom is destroyed, Kenai leads a team of survivors (including Togepi, D.J., and Rainbow Dash) as they fight evil on Third Earth.