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When Peter and the guys try to salvage a sunken Mercedes-Benz, Peter half-heartedly promises a favor to a helpful dolphin named Billy Finn (guest voice Ricky Gervais).
When Billy shows up at Peter's door looking for a place to stay after his wife throws him out, he reluctantly lets him stay.
After a few days, Peter finally tires of his new house guest & tries to reunite Billy with his wife.
Meanwhile Stewie tells Brian about his abusive nursery school teacher but Brian is reluctant to take action when she turns out to be someone he wants to date.
‘Be Careful What You Fish For’ received 5.390 million viewers
FOX's original press release for this episode stated Billy Finn and his family were going to move into Cleveland's old house but this never happened in the episode.