Daytime Heroes: Felix the Cat in King Neptune's SOS (1959)
We all know cats hate water. Yet Felix the Cat, without the aid of breathing apparatus, goes underwater to put a stop to the Professor's latest greedy scheme in "King Neptune's SOS":
At this point, Felix had fancied himself as a detective, and had just wrapped a previous case involving the Professor and his aide, Rock Bottom. Maybe Felix was too hasty to stamp it case closed, but now, that's kinda moot.