十多年前，各地突然出現連接異次元與現實世界的＂傳送門＂，而世界上也開始出現覺醒了超人般力量、被稱之為＂獵人＂的覺醒者。”獵人”們利用其自身能力，攻略各地傳送門內的地下城並以此為業，而在眾多強大獵人中，有位被稱為人類最弱兵器的下級獵人”成振宇”。某一天，他進入了隱藏在低級地下城中的雙重地下城，就在振宇身負重傷，瀕臨死亡之際前，他的面前突然出現了一道神秘任務視窗。危急之際選擇接受任務的振宇，發現了自己有了”升級”的能力…。

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".