Star Trek: Enterprise

Season 1, Episode 11

Episode Title: Cold Front

Air Date: 2001-11-28

Overview:

When the Enterprise comes in contact with an alien vessel transporting stargazers to observe a spectacular stellar event, Archer invites them aboard the ship not realizing that Silik, a Suliban enemy, is among them. Archer quickly realizes that Silik is engaged in a nefarious time-travelling mission and must stop him before he can tamper with the course of history.