Cal invents the Time Lense, and by "invents" I mean "says". A highly anticipated glimpse in the 24½th century forms the bulk of this week's episode, forcing us to rethink some of the fundamentals of the continuum.

In other news, Sylvester goes back to his roots in the hope of restoring his life essence, and a middle-aged divorcee called Michael takes his deviant ways to Europe proper.