The Comet in Little Star.
Comet is a super fast comet who knocked Little Star from the sky and falls down into the Earth. Comet appeared in the episodes Little Star and Tuga Helps the Moon.
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The Comet in Tuga Helps the Moon.
In the Go, Diego, Go! episode Tuga Helps the Moon, there is a comet that looks almost exactly like the one from Dora the Explorer, except it has blue eyes with black pupils, whereas the one mentioned above has white eyes with blue pupils.