The CW has released the official synopsis for "Camelot/3000," February 21's episode of DC's Legends of Tomorrow.

You can check it out below.

The Legends continue their quest to hunt down the Spear of Destiny before the pieces fall into the hands of the Legion of Doom. The Legends discover that pieces of the Spear are each being guarded in different time periods by members of the JSA. Their first stop is the future where they find Dr. Mid-Nite (guest star Kwesi Ameyaw) which eventually leads them to the past and King Arthur’s Camelot, where Stargirl (guest star Sarah Grey) is protecting her piece of the Spear. In order to protect the Spear shard from the now-evil Rip Hunter (Arthur Darvill), the Legends must join forces with the Knights of the Round Table.

Caity Lotz, Franz Drameh, Victor Garber, Brandon Routh, Dominic Purcell, Nick Zano and Maisie Richardson-Sellers also star. Antonio Negret directed the episode written by Anderson MacKenzie. The Justice Society was announced at the beginning of the season, along with the Legion of Doom -- but other than a brief appearance early in the season, it seemed their only role was to give the team to Vixen.

Seeing them come back into the fray -- and playing this particular role, no less -- is a game-changer for the fact that the season premiere featured one of the artifacts that leads the Legion of Doom to the Spear of Destiny was found in the JSA headquarters, guarded by Hourman.

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DC's Legends of Tomorrow moves to Tuesday nights at 9 p.m. ET/PT when new episodes resume later this month. “The Legion of Doom” debuts on January 31.