Tommy Tricker and the Stamp Traveller (1988)

"Running to a theatre near you, December 16th."

When the joker Tommy Tricker plays some practical jokes on some of his friends, his best friend Ralph, a stamp collector, discovers the secret of "stamp travel" to make him travel around the world on a stamp to bring back the mysterious Charles Merriweather, who never returned on a stamp for 75 years.