美国NBA传奇人物迈克•乔丹（Michael Jordan）在事业最顶峰之际引退篮坛，决定转入职棒。与此同时，怪物行星的太空游乐场经营遭遇窘境，游乐场老板派出手下的小怪物们前往地球，目的是绑架华纳公司包括兔八哥、太妃鸭、三只小猪等在内的动画片明星们为游乐场招揽顾客。为了维护自由，动画明星们紧急磋商对策，他们自作聪明认为外星怪物身材短小，于是决定采取篮球比赛的方式决定胜负。 不过动画明星的如意算盘落空，小怪物们暗中盗取了皮蓬、巴克利等NBA明星们的球技，变成了身形健壮修长、球技高超的怪物篮球手。眼看败局已定，兔八哥紧急找来迈克•乔丹助阵，决定动画明星去留的时刻越来越近……
After winning the third championship with the Chicago Bulls, Michael Jordan announces his retirement from basketball and declares his intention to play baseball. Meanwhile, deep in space, on another planet called Moron Mountain, an outer space theme park, Mr. Swackhammer sends five tiny aliens known as the Nerdlucks to go to Looney Tune Land and capture all the Looney Tune characters and take them to Moron Mountain. But the Looney Tunes think of a plan to find a way to escape slavery on Moron Mountain. And Bugs Bunny decided to defend themselves by challenging the Nerdlucks to a basketball game. Then the Nerdlucks use their strange powers to steal the talent of five NBA stars such as Charles Barkley, Patrick Ewing, Muggsy Bogues, Larry Johnson, and Shawn Bradley which they'll ultimately transform themselves into the tallest and muscular Monstars. It's up to Michael Jordan to help the Looney Tunes play a basketball game vs. the Monstars. But if the Monstars win, then Swackhammer gets the Looney Tunes, and along with Jordan to Moron Mountain.
