Watch Britannic for Free: How to Stream the Movie Online at 123Movies. . It was the sister ship of the infamous Titanic... and its final destiny was the same. Experience the true untold story of Britannic, a tumultuous, epic voyage of human passion, courage and betrayal aboard an ill-fated ocean liner bound for a shattering demise. With the world at war, an undercover British agent (Amanda Ryan), embarks the Britannic in search of a German spy believed to be on board to sabotage the ship. Posing as a governess, the undercover agent finds herself falling in love with the ship's chaplain (Edward Atterton). In a stunning discovery, the lovers suddenly find themselves enemies of war. And when a massive explosion deals a deathblow to the ship, their battle becomes one for their own survival. With a dynamic, international cast and a story line that hosts a chilling tale of espionage, politics and romance, Britannic brings one of history's most devastating events to riveting, new life.