The CW has released a promo for next week's "Legends of Tomorrow" episode, titled "Leviathan."

RELATED: "DC's Legends of Tomorrow" Seek Refuge from a Time-Travelling Assassin in New Clips, Featurette

The episode sees the debut of Jessica Sipos as Savage's daughter, Cassandra, as the team headers to London -- in the year 2166 -- three months before Rip's family is killed.

Check out the "Leviathan" promo below:

LONDON 2166 - Rip (Arthur Darvill) takes the team to London in the year 2166, three months before his family is killed. He believes this to be their final opportunity to take out Savage (Casper Crump) who is, unfortunately, at the height of his power. However, the team discovers two key elements to defeating him - Savage's daughter (guest star Jessica Sipos) and the means to kill Savage once and for all.

RELATED: First Look at Vandal Savage's Daughter In New "Legends of Tomorrow" Pics

"Legends of Tomorrow" airs Thursdays at 8/7c on The CW.