The Fresh Kickers have resolved their inner turmoil and begin their journey to the biggest concert of their lives, the annual Hall of Fame Ball. Chewy the squirrel is high strung and nervous, even on a good day, but traveling underwater in a submarine turns him into a jittery mess. The journey to the Grand Hall Theater is filled with danger, but the attacking fish and ripping currents of the Grand Gorge are soon forgotten when an accident plunges the band and their submarine, the Onyx, into the deadly depths of the chasm. As the sub lies helpless on the floor of the immense canyon, the passengers begin to run out of air, wondering if they'll live to see the light of the upper world again.