Which TV series set did Mister Rogers visit behind the scenes in one episode?

Mister Rogers visited the set of The Incredible Hulk behind the scenes. In the 1980 episode, he went to Universal Studios and met actor Lou Ferrigno, showing viewers how Ferrigno was transformed into the Hulk through costume and makeup.

The visit fit Rogers' long-running approach to children's television: unfamiliar or frightening images could become less scary when children understood how they were made. Seeing the performer before and during the transformation helped separate the fictional monster from the real person playing him.

The episode is sometimes remembered simply as a Hulk appearance, but Rogers did not present the character as a real creature. The segment focused on television production and the people behind the illusion. This also distinguishes it from the show's many visits to ordinary workplaces and from its encounters with other children's programs such as Sesame Street or Captain Kangaroo.