影片故事设定在一个融合东西方文化(旧金山+东京)的虚构大都市旧京山(SanFransokyo)中,一位精通机器人技术的小神童滨田广(Hiro Hamada)发现,这座充斥高新技术的城市正遭遇着一场犯罪危机,为了拆穿阴谋拯救家园,他将携伙伴机器人Baymax,与一伙生拉硬凑的菜鸟团队组成“六大英雄”联盟,共同作战抗击罪恶。 Protagonist Hiro Hamada is a 14-year-old robotics genius who lives in the futuristic (fictional) city of San Fransokyo and spends his time participating in illegal robot fights; to amend which, his older brother Tadashi takes him to the robotics center at his university, where Hiro meets Tadashi's friends: GoGo, Wasabi, Honey Lemon, and Fred, as well the healthcare robot Baymax that Tadashi created. To enroll in the school, Hiro presents microbots: swarms of tiny robots that can link together in any arrangement imaginable — to Professor Callaghan, the head of the school's robotics program. When a fire breaks out at the university, Tadashi rushes in to rescue Callaghan, but both are killed, and Hiro secludes himself. One day, Hiro accidentally activates Baymax, who follows one of his microbots to an abandoned warehouse. There, the two discover that someone has been mass-producing Hiro's microbots, and they are attacked by a masked man in control of them. To catch the man, Hiro equips Baymax with armor and a chip containing various Karate moves. After the masked man attacks Hiro, Baymax, GoGo, Wasabi, Honey, and Fred, the six form a superhero team, who discover a former laboratory of Krei Tech, a prestigious robotics company experimenting with teleportation technology until the disappearance of a test pilot, and identify the masked man as Professor Callaghan, who stole Hiro's bots to escape the fire. Realizing that Tadashi died in vain, Hiro removes Baymax's healthcare chip and orders him to kill Callaghan. Baymax almost does so, but Honey re-installs the healthcare chip to stop him. To console Hiro, Baymax plays several humorous videos of Tadashi running tests during Baymax's development. The group discovers that the vanished test pilot was Callaghan's daughter Abigail, and that Callaghan is seeking revenge on Krei, the president of Krei Tech, for his daughter's death. The team saves Krei and destroys the microbots; but the teleportation's portal remains active. Baymax detects Abigail inside, alive, and he and Hiro leap into the portal to rescue her. To ensure the both Hiro and Abigail's safety, Baymax uses his armor's rocket fist to propel them back through the portal opening, and stays behind. Hiro and Abigail make it back, and Callaghan is arrested. Sometime later, Hiro discovers Baymax's healthcare chip (which contains his entire personality) clenched in his rocket fist, and rebuilds him, whereafter the six friends continue their exploits through the city, fulfilling Tadashi's hope of helping those in need. During the end credits, it is shown through newspaper headlines that Hiro has been awarded a grant from the university and a building is dedicated to Tadashi. In a post-credits scene, Fred accidentally opens a secret door in his family mansion and finds superhero gear inside. His father, a retired superhero, arrives stating that they have a lot to talk about as they embrace.
一共52集动画。由美国方面制作推出,采取革命性的3D动画模式,日本版本为美版的配音输出版本。美版动画将其划分为第一季26集(SEASON 1),第二季13集(SEASON 2),第三季13集(SEASON 3)。日版动画则把第二季和第三季一共26集称为“BEASWT WARS METALS”。国内引进时全部一起播出,翻译为“超能勇士”。 汽车人后代巨无霸(港译:密斯姆)与霸天虎后代原始兽(港译:巴达乾)继续战斗着。巨无霸领袖黑猩猩(港译:奥迪武)率领分队追击原始兽的霸王龙(港译:麦卡顿),双方穿梭时空来到史前地球并坠毁在地球上。为了抵御地球的能量乾扰,他们都使自己变形为野兽,开始了一场野兽战争BEAST WARS。双方在地球上陆续发现外星人的机关,在与外星人较量中,部分变形金刚转化为恒定的金属变体(TRANS METALS),战斗异常激烈。霸王龙发现古老的战舰方舟号,并试图摧毁未苏醒的擎天柱而改变历史。黑猩猩在对战中吸收了擎天柱的力量而进化为TRANS METAL 2,霸王龙也通过吸收威震天的力量而进化成红色火龙。外星人介入,但被消灭。霸王龙最后找到了霸天虎的古老战舰报应号,并试图驾驶它摧毁方舟。最后报应号被击落,霸王龙被抓获,巨无霸返回塞伯坦