Webster

Webster was a 1980s TV series whose final episode, Webtrek, was a crossover with Star Trek: The Next Generation (as the show was produced by Paramount Television). The show's premise was that a wealthy couple must unexpectedly adopt a young boy named Webster.

Webtrek
This episode has Webster transported into the future and aboard the USS Enterprise-D, where he has a conversation with lieutenant Worf and relates some of his experiences to him. Webster is ultimately returned to his own time, where he questions if the experience was a dream - only to discover he still has his souvenir from his visit to the Enterprise.