Mister Rogers arrives with a wooden pentagon which he describes by counting the sides. Moving to Picture-Picture, Mister Rogers shows viewers a very short film about fish before deciding to look at the fish in his own aquarium. In doing so, he notices a dead fish laying at the bottom. Mister Rogers carefully removes the fish and attempts to revive it with salt water. Unfortunately, the fish does not respond. Using a paper towel to wrap the fish, Mister Rogers prepares to bury it in his yard. Quietly moving outside, Mister Rogers finds a spot to lay the fish to rest. He then reflects on the sad feelings he had as a child when his dog died and the difficulty he had in saying goodbye to his pet. Back inside, Mister Rogers talks about his memories of his dog and shows a picture of her to viewers before singing Sometimes People Are Good ("Sometimes people get sad"). Heading into a time of make-believe, Mister Rogers lifts up the Trolley to show its wheels. In the Neighborhood of Make-Believe, Lady Aberlin and Bob Dog become concerned when the Trolley stops moving. Dr. Bill Platypus is brought to the track to check on the Trolley and determines that the Trolley simply had a wheel come off the track. Back at the house, Bob Trow helps Mister Rogers use the wooden pentagon to create a marker for the spot where the fish was buried. Inside, Mister Rogers sings Some Things I Don't Understand and talks about this importance of talking about your feelings and how everyone responds differently to sad feelings. Part of the "Mister Rogers' Neighborhood" series.