Take a look at Famous Studios’ “Casper” cartoon short “Doing What’s Fright” (1955), co-starring ‘Spooky’, directed by Seymour Kneitel and Thomas Johnson, on the news that Disney+ is developing a new live-action “Casper the Ghost” TV series, with Rob Letterman and Hilary Winston (“Goosebumps”):
“…’Casper the Friendly Ghost’ tries to stop his cousin ‘Spooky’ from ‘April Fooling’ mortals, while scaring them at the same time.
“Spooky immediately makes Casper an April-Fool's victim. Casper tries his best to persuade Spooky to stop playing tricks on people but to no avail. Casper decides that Spooky has to be taught a lesson…”