"The Big Melt" is the thirty-fifth episode of the Sonic Underground television series. It first aired on 5 May 1999 in France and on 15 October 1999 in the United States. It was included in Volume 2 and Ready, Aim, Sonic!.
The song performed in this episode is "Fun In The Sun".
During their war against Robotnik, the trio of hedgehogs decides to take a well-deserved break. Unfortunately, the Hedgehogs' vacation is interrupted when the Polar Resistance delivers news of Robotnik's latest weapon to them. Sonic, Manic and Sonia must travel to the arctic where the weapon is located. They are shocked as the submarine melts the icy landscape from under their feet. The Hedgehogs then scurry to locate the lethal submarine before the entire planet is completely submerged underwater.