The Evil Mad Scientist is fed up with the Looney Tunes and plans to get rid of them once and for all. Using his homemade time machine and giant ACME eraser, he will travel through time and erase the 'Tunes and their ancestor from existence.
Little does the Mad Scientist know, Bugs Bunny and Marvin the Martian have stolen the designs to the time machine and built one of their own. Now, it's up to the entire Looney Tunes gang - with the help of ACME weapons - to chase the Mad Scientist through the ages ... defending their past, present, and future!