J.R.R. Tolkien will be making a appearance in the season finale and will by played by actor Jack Turner.
Katie Cassidy will returning as Laurel Lance in the season finale.
Ep 14 "Moonshot" synopsis
HOUSTON, WE HAVE A PROBLEM — When the Legends track Commander Steel (guest star Matthew MacCaull) to NASA Headquarters in 1970, they learn where Nate’s (Nick Zano) grandfather hid the last fragment of the Spear of Destiny. The team notices a time aberration during the Apollo 13 mission and believes that the Legion of Doom might be involved. As the Legends journey into space to intercept Apollo 13, the Waverider suffers massive internal damage and Ray’s (Brandon Routh) life is left in jeopardy when he is stranded on the moon. Meanwhile, tension grows between Rip (Arthur Darvill) and Sara (Caity Lotz) as to who is the leader of the team.
Preview pics from Ep 13 "Land of The Lost"
Ep 15 "Fellowship of The Spear" synopsis:
IT’S WAR — The Legends must devise a plan to retrieve the last remaining fragments of the Spear of Destiny from the Legion of Doom. They find themselves in France at the height of World War I faced with the knowledge that they must destroy the mystical object. They enlist the help of a soldier by the name of John Ronald Reuel Tolkien (guest star Jack Turner) and find that the Spear is leading them into the heart of the war. Meanwhile, the team must all resist the temptation of the Spear, and the return of a former teammate.