The Silver Chair
The Silver Chair was shown on BBC television in 1990. It was the third and final series of The Chronicles of Narnia that ran from 1988 to 1990.
When friends Eustace Scrubb and Jill Pole stumble into Aslan's Country when trying to escape bullies at their school, Jill is given a quest by Aslan the Talking Lion. They must save Prince Rilian, son of King Caspian, from the Evil Green Lady. Rilian disappeared 10 years earlier after weeks of searching the woods near Cair Paravel for the serpent who had killed his royal mother, the Queen. However, their task is complicated by the fact that they both got separated on their arrival into Aslan's Country, when Eustace fell from a cliff and was blown to Narnia by Aslan, who soon blows Jill in the same direction. A great ship has just set sail from Cair Paravel, and a talking Owl (Glimfeather) appears and informs Eustace and Jill that the King of Narnia has just departed on his ship. Eustace is horrified to realise that the elderly man boarding the ship was indeed Caspian, who is now decades rather than years older than Eustace himself - as 50 years have passed in Narnia while less than a year has passed on Earth.