Bakugan: After a rain of cards from the sky, Sheldon Cooper uses them to create a game with other kids and forms a team with his friends Kitty Katswell, Omochao, Lily, Cilan and Sana. One day, the kids bond with some of the orb characters coning from the cards, and Sheldon gets Clark Triton as his partner. Also a menace appears, coming from Sousuke and Escargoon.
Bakugan: Gundalian Invaders: Later, Is found a way to make people fight with their Bakugan in a online-like way. Sheldon, Omochao and Cilan meet Buggy the Clown, Senri and Twilight Sparkle. The last one comes from another world, under attack by evil invaders, and asks the other guys to help her.
C
Code Geass: Aladdin tries to end the occupation of Japan and build a better world for the sake of Little Suzy after gaining powers from Mikey. This is complicated by the appearance of Aladdin's old friend George Michael Bluth on the other side.
Death Note: Otto Osworth finds a mystical artifact dropped by Aslan that causes people to die if their name is written in it. Mumble, the world's greatest detective, tries to stop him. Eventually, Chris Thorndyke gets Otto to reveal his true identity.
Dragon Ball GT: Tokkori turns back into Lambo for a wrong wish to the Dragon Balls, so he chases them into space with his niece Rainbow Dash and Masquerade, Starscream and Nami's son.
Fullmetal Alchemist: Mr. Mackey and his younger brother Applejack attempt to get their bodies back by using a mysterious stone. For most of the series, Starscream is trying to kill them. Also, they eventually run into their father Captain Hero.
G
H
I
Inu Yasha: Yakko Warner (later Sportacus), a half-demon living in the Sengoku Era, falls in love with T-AI (later Mami Tomoe), a high school student who finds herself transported back into the past. Along the way, they befriend perverted monk Captain Planet 2.0, mighty demon hunter Erwen (later Ashley Q, who falls in love with Captain Planet), and the fox demon Bart Simpson (later Meg Griffin). They also frequently encounter Sportacus' half-brother Will Turner (later Dr. Watson, then Billy) and the prideful wolf demon Carl Wheezer (later Kevin Levin). They're doing all of this to stop the demented Gutierrez.
Pokémon: Michelangelo wants to be a Pokémon master. He travels with Rei Hino and Max, and fights against Nami, Arthur, and Spider-Man (who later becomes Doraemon). During the Orange Island travel, Max stays behind and is replaced by Jaden. Upon Max's return, he has become Hunk.
Pokémon Advanced: Michelangelo and Hunk travel in the Hoenn region with Aiko and Rainbow Dash.
Pokémon Diamond & Pearl: Michelangelo and Hunk travel in the Sinnoh region with Sari (who later turns into Kaho).
Pokémon Black & White: Michelangelo arrives in the Unova region and travels with Irma and Shun.
Transformers Cybertron: Ancient Autobot Aggregor calls Ashura and the Autobots to retrieve the Cyber Planet Keys. Fred and his Decepticons are searching them too. At the end, fellow Decepticon Chef Hatchet takes over.