The Crab was seen on board Manny, Diego and Sid's "ship" during a storm. It climbed on it and roared. Sid, commenting on its size,
Trying to escape, Sid ended up trapped on the edge of the floating island. Just before it attacked, the crab noticed a giant wave heading towards them, Sid, noticing it too, clutched onto the crab's leg in a terrified trance. As soon as the wave was gone, Sid tried to thank the crab for saving his life, but was horrified to see only its leg remaining and the rest of the body gone, the leg being blown away by strong winds. It is unknown if the crab survived but it is likely due to the fact he is a sea creature and crabs can regenerate lost limbs.