Dexter's Laboratory : Filet of Soul (1997)
Directed by Genndy Tartakovsky
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Synopsis by Emru Townsend
When their day-old goldfish dies after the kids overexert him, they're given the responsibility of flushing him down the toilet. Dee Dee balks at the task, and puts the fish on top of the toilet -- out of Dexter's reach -- until he can be given a proper burial the following day. When the ghost of the goldfish haunts them, Dexter decides it's time to get his ghost-busting gear. (Original air date: September 3, 1997.)