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Bluella was a female whale who washed up on the shore of Springfield.
After Bart and Lisa set out to look at the damage after a windstorm hit Springfield, they found a female whale who was washed up on the beach. While Bart fooled around, barely paying attention to the problem at hand, Lisa named the whale Bluella, and took it upon herself to get the whale back in the sea.
Lisa spent many hours with the whale trying to comfort it, by reading it a story. Unfortunately, spending all day with Bluella tired her out, and she fell asleep next to the whale.
In her dream, she saw that the residents had lifted Bluella up by helicopter, and were carrying her back to safety in the sea. They released Bluella and she swam through the water happily. Lisa thought the problem was solved, but after seeing the whale somehow flying up into the air and swimming through the sky, she woke up. Then she realized it was too late, and Bluella was now dead.
After a while, many townspeople came to see Bluella be blown up by dynamite to get her body off the beach. After this, Lisa saw two baby whales swimming through the sea, trying to call out to another adult whale. Lisa realized the whales were Bluella's children and they were calling out for their father. Near the children though, were sharks, trying to eat them. Lisa and Homer went out into the sea and tried to get the sharks away from the whales, but met opposition from the "Sea Huggers", who were there to protect the sharks. Homer managed to get past the Sea Huggers and distract the sharks from the whales, but found himself in grave danger when he was bleeding in the water as the sharks circled him. Lisa thought it was all over, but just then, the father whale burst out of the water, rescuing Homer and pushing the sharks away from the whales. It was a happy ending for Lisa, and Homer too.