Robert Foster

 is the son of June Foster, who is one of Samantha's neighbors.

While his mother and other neighbor ladies are at Samantha's house, he, Stephen Clyde and another neighbor boy make nuisances of themselves upstairs with Endora. Fed up with their antics, Endora magically ties them up with rope.

Later, when Gladys Kravitz sees them, she questions how all three of them could have tied each other up, but the others are too distracted to listen to her.