Star Trek: The Next Generation – All Good Things [7.25]

Picard finds himself mysteriously moving back and forth between three different eras of his life:  the day when he first came aboard the Enterprise as Captain, far future when he is long-retired, and the “present day.”  In all three time frames he becomes aware of a mysterious anomaly in space that threatens to destroy the universe.  He is also told by Q that he must solve this mystery in order to prove that humanity is worthy to exist.