马小乐（李佳怡 配音）是一个课业繁重的小学生，爸爸（姜广涛 配音）还发明了一个智能玩具“大头”（黎筱濛 配音）来监督他。苦恼的马小乐偶然遇到了拥有神奇能力的精灵“小黄帽”（赵慧珊 配音）并和他成了好朋友，要学习还是要快乐，大头与小黄帽各显神通，展开较量。但是爸爸设计的新 武器太厉害，危急时刻，小黄帽带着马小乐逃进了时光隧道，马小乐在这 里竟然遇见了小时候的爸爸（山新 配音）。等待他们的是什么样的奇遇呢？

和所有的小學生一樣，馬小樂（李佳怡配音）總是覺得要做的作業太多，可以用來玩的時間太少。為了督促馬小樂學習，喜愛發明創作的爸爸還做出了一個名為「大頭」（黎筱濛配音）的智慧玩具，整天跟在馬小樂屁股後面，讓他煩不勝煩。

　　一次偶然中，馬小樂遇見了精靈小黃帽（趙慧珊配音），很快，同樣單純善良的兩人成為了朋友。小黃帽覺得馬小樂就應該盡情的享受無憂無慮的快樂童年，而不是每天都被作業淹沒，因此，它和大頭展開了勢均力敵的較量。小黃帽不敵大頭眼看就要落敗，在這個節骨眼上，小黃帽帶著馬小樂進入了時光隧道穿越回了過去。

Like all primary school students, Ma Xiaole always feels that he has too much homework to do and too little time to play. In order to urge Ma Xiaole to study, his father, who is fond of inventions, makes a smart toy called "Big Head", which follows him around all day long and annoys him to no end. By chance, Ma Xiaole meets the elf Little Yellow Riding Hood, and soon the two of them, who are also simple and kind, become friends. Little Yellow Riding Hood thinks that Ma Xiaolei should enjoy a carefree and happy childhood instead of being overwhelmed by homework every day, so he and Big Head start an even battle. Little Yellow Riding Hood is defeated by Big Head and is about to lose. At this juncture, Little Yellow Riding Hood takes Ma Xiaole into a time tunnel and travels back in time!