Doraemon: Nobita's Great Battle of the Mermaid King

Phineas and Ferb travel across the galaxy to rescue their older sister Candace, who has been abducted by aliens and taken to a utopia in a far-off planet, free of her pesky little brothers.

Doraemon and his friends have to rescue the people of Birdopia from the wrongdoing of vengeful former bird troopers before they unleash a wicked ancient dragon.

Shizuka ends up in the fantasy world of the 'Arabian Nights' story. However, Doraemon, Nobita, Suneo, and Jyaian must find her from the imaginary Middle East and bring her back to the real life.

Doraemon went missing for 3 days. But it turns out later that he went to the 22nd century to buy a mystery galactic express train ticket whose destination is a secret until the passengers arrive there and see for themselves.