Watch Full Movie Online. Casper, the Friendly Ghost, encounters his misbehaving fellow-ghost, Spooky, and Spooky immediately makes Caster an April-Fool's victim. Wimpy (as always) 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 and sets out to do so.