(0:00) Various scenes of the Great World War flash in and out alongside the three character frames of Lelouch, Suzaku and Kallen. After this, it shifts to "Geass masks" and gears alongside the aforementioned war scenes. This is then followed by the "two planets" image with the Code Geass Megiddo title panning in.
(0:14) The scene shifts to an image of teenage Lelouch dressed in his original Zero costume falling back much like Viletta did in the second opening, symbolizing his being taken into captivity, before being replaced by his current version in his Britannian uniform. In the middle of this, an image of a younger Kallen is depicted in both her Stadtfeld and Kouzuki identities respectively, before being replaced by her older, long haired self in her new Black Knight uniform, wielding Hiryu much like Misuzu in the 11eyes opening. Suzaku then flashes as his younger, somewhat more optimistic self that's dressed in his original uniform, before being replaced by his older self in Knight of Seven gear with a sterner expression. Behind him is a blacked out image of Genbu.
(0:29) The scene changes to Charles sitting upon his throne, grinning as he gazes down at a digital map floor (think Damocles), which the camera pans back to show in its entirety. Much of the Earth's continents on this map are blue to symbolize Britannia's dominance, and then after a moment the map shifts to a purple color with the continents turning white (as in Lelouch's declaration in R2) as if to show Britannia's true influence.
(0:34) The scene switches to Operation Nero's progress and fallout while a transparent map screen of Area 11 is glossed over it, which turns red while the letters and number disappear in reverse (essentially the opposite of first season's opener).
(00:38) Next comes the World of C, in which the screen lowers down from Jupiter to show C.C.'s silhouette standing in front of it, just as she reaches out toward the camera. Following that comes various images depicting the Black Knights standing in formation in their new uniforms, then coming up to the images of the principle Black Knights (Ohgi, Tohdoh and the others) looking forward with serious gazes (with only Rakshata showing a grin), before finally coming to a shot of Kallen standing on the palm of the Guren's radiant wave surger, gazing outward with left hand on Hiryu at her hip and the "kama" of her uniform flapping in the wind.
(0:55) The scene then switches to an open sky much like in Chapter 4, where the Artorius, Lancelot, Tristan and Hector fight it out with their respective opponents. Gino twirls the Tristan's poleaxes in an elaborate show, while Anya takes on multiple units with the Hector's micromissile launchers before switching to her stark hadron cannon. Meanwhile, the Lancelot moves past the Hector only to be intercepted by the Zangetsu.
(1:05) The fight between the Artorius and Guren then comes in, in which a cockpit shot of Lelouch fades in. Lelouch appears determined at first, but then his left eye begins to glow and he grasps it in pain.
(1:14) Following all this comes a shot of a garden, in which an older version of Nunnally is depicted turning toward the camera, though her face is obscured by her hair, just as the screen cracks and shatters.
(1:18) The opening concludes with Britannian and Black Knight forces gathering, seemingly against each other, just as the screen fades out while showing a silhouette of the new Zero between them.
(1:24) The final shot is, naturally, a chessboard which depicts all the pieces set in their starting positions except for the Black King and a White Knight, which are in the middle of the board directly in front of the other.
(0:00) The opening begins in the "Geass tunnel", in which C.C. is fading in and flying around (in her Black Knight dress as opposed to being naked) before she comes up to the camera and her forehead opens to reveal her Code, which flashes and brings in the main title against a black background.
(0:16) Lelouch/Zero falls through what appears to be stained glass (much like how Maka was falling into that water). As Lelouch continues to "fall" slowly, various images of the past appear on the glass, a la images from season one, before he eventually falls back into the black with the shards trailing him.
(0:28) The camera then focuses on the Geass in his left eye, before focusing out to show a new scene with Charles sitting on his throne, Geass active, with twelve Knights of the Round kneeling before him. At that, Anya looks up and uncharacteristically grins while her eyes light up around the rims.
(0:36) A shot of V.V. then comes in, with him sitting on his throne amidst the monoliths of the Masters' Council, flanked by Jeremiah and an obscured Inquisitor, with Jeremiah's Geass Canceller alight in blue while the Inquisitor's Geass flashes brightly from the shadow as a "red monster eye".
(0:40) Following that is a shot of Xingke turning to glare toward the camera while the Four Beasts are in the background along with several Gun Rus, while a transparent Chinese flag waves behind them all. This is then subsequently replaced with a shot of Rommel in the same position as Xingke had been in but looking over from the opposite side (his shot and Xingke's are based on this part of the Noir OP at 0:43), grinning confidently while the airborne Koenigsloewe is shown behind him along with several Panthers and Leopards, as well as the transparent EU flag.
(0:44) A new scene fades in depicting the "Dive to the Heart" realm that Lelouch fell into, only showing him, Kallen and C.C. standing back to back to each other on the main stained glass platform of Zero, while the camera circles showing them and the various stained glass images around them. One after the other they open their eyes, starting with C.C., then with Kallen with her Geass active and then finally centering on Lelouch whose Geass is also active, only his eyes narrow with certain ferocity.
(0:51) Cue the battle, in which the Artorius leads the Gurens (Nishiki and Isshikis), Zangetsu and several Akatsukis against random Sutherlands and Gloucesters. The battle continues with the Artorius ripping apart several units until the Lancelot appears and attacks it with its MVS, the images of Lelouch and Suzaku in their pilot suits fading in depicting expressions of pure ferocity like on Kamine Island during the season one finale, while "Black Papermoon" sounds out.
(1:03) Another image shows several Knights of the Round fighting Kallen in the Guren, which fades into her cockpit showing her own fierce expression, the camera eventually centering around her Geass eye (to show its growing power), then fading out again to show her in another area looking toward the back of Lelouch, who is standing off directly in front of the camera while Kallen is in the distance. In this shot, Kallen has her fist over her heart and a softened look of concern and feeling.
(1:09) Another shot of the World of C and the Jupiter image, which quickly lowers down to show an obscured figure standing before it, looking toward the camera with both eyes fiendishly alight with Geass. From there, another scene fades in showing Cornelia looking out toward the horizon, her eyes narrowed with determination while an image of Euphie (back turned) appears behind her.
(1:15) The final shot shows Lelouch reaching out desperately toward an image of Nunnally sitting in the garden much like in R2's first op, only the image fading out into the background, before turning back to Lelouch who closes his eyes and cries out just as the music begins to play down. The final shot is once again with a chess piece, this time the profile of the Black King standing amidst several other pieces.