S1·E56 Lighthouse

When Po is eating her Tubby Toast, she listens to a Voice Trumpet sing Twinkle Twinkle Little Star and a magical star appears. She hears Tinky Winky, Dipsy, and Laa-Laa coming back and shows them the magical star before it disappears. The Teletubbies watch two children whose father is a lighthouse keeper and learn that lighthouses have lots of steps. The Teletubbies then watch The Three Ships sail through Teletubbyland.