10年前，世界与其他次元链接的“门”被打开，各种魔物不断出现，于是乎能力各异的猎魔者也随之出现，被称为“猎人”。程肖宇(成振宇)是一名实力最弱的E级猎人，在一次挑战任务中，遇到了可怕的隐藏挑战。生死存亡之际，他居然获得了升级系统！在系统的利用下，他能成为最强猎人吗？

Level Up was a live-action television series that is broadcast on Cartoon Network. A film with the same title, which served as a pilot for the series, premiered on November 23, 2011. The series premiered on Tuesday, January 24, 2012, at 8 p.m. ET/PT. The series later ended on February 19, 2013.

It is one of the only Cartoon Network shows outside of Adult Swim to have the U.S. rating of TV-PG-V. Its rating in Canada for most episodes is "G", or else "PG".