Octonauts (2010)

S1E50 The Giant Spider Crab

The Octonauts come to the aid of a century-old spider crab whose leg is caught in a massive clam while making its way to its 100th birthday celebration. Kwazii, who has a fear of spiders, initially mistakes the crab for a real spider but overcomes his fear to assist. Despite his apprehension, he steps up to help the crab in its time of need.