The Connections puzzle in the New York Times on Friday contains a little Easter egg for fans of a popular TV show airing new episodes this spring. Connections is a daily puzzle where you find the hidden association between groups of words on a grid.

Plenty of actors have appeared in multiple sci-fi TV shows over the years, and you can chart a path through classic series by following a performer from one project to the next. Sci-fi is one of the most popular TV genres, and with so many shows, you'll ...