Guren and the others learn that the Black Dragon Key is hidden inside the building were his father works. As the group decides to look inside, Chooki still has doubts that Beni wont betray them.
Guren is marveling at the fact that the Black Dragon Key is hidden inside the building were his father works, Benham Tower. As the group decides to look inside, Chooki suggests Beni wait for them outside. Ceylan appears to side with Beni, only to take her Core Brick as insurance that she won't try to betray them.
Back on Earth, Gen and Guardian Eurus observe as Guren and the others make their way up Benham Tower. As the boys, plus Beni make their way up the elevator. Their elevator suddenly stops as power goes out over half of Benham City. Once the emergency power kicks in and they make it to the next floor, the group decides to take the stairs the rest of the way.
On Quarton, Slyger suddenly realizes the reason the Guardians don't attack Vilius as a group is because two of them are protecting the portal to Earth, which is invisible to the eye. When he tells this to Vilius, Vilius attempts to access the portal.
Meanwhile, the boys and Beni make their way to the roof of Benham Tower and a port for their core bricks appears. The boys place the core bricks and transform. Once in Tenkai Knight form, the boys are confronted by a barrier that guards the Black Key. They disable the barrier and are granted the Black Dragon Key. But just as Guren gets ready to destroy the key, Gen appears. Guren accuses Gen of being Dromus, a truth to which Gen concedes. Beni also reveals that she'd never betrayed Gen. A fight breaks out over the key. Gen manages to retrieve the key, but Chooki points out he has nowhere to run. Just then, Guardian Eurus appears and time is frozen for Guren and the others. The boys then watch as Gen, Beni, and Eurus escape with the key and Beni's core brick.
Back on Quarton, Boreas attempts to stop Vilius from accessing the portal, claiming he'd rather it be destroyed than fall into the warlords hands. Boreas then gives off a bright light that blinds Vilius and Slyger. As this is happening, Guren and the others race back to Mr. White's shop and ask what's happening. Mr. White worriedly tells them that they should go to Quarton immediately. Meanwhile, Gen, as Dromus, and Beni, as Venetta, are already back on Quarton with the Black Key.
In the episode
- This episode reveals the name of the green Guardian as Zephyrus.
- This episode used to go by the title "Vilius on the Go".
- This episode aired on September 6, 2014 in Japan, the same day where new episodes were broadcasted again on Cartoon Network in the U.S., starting with "Dragon".
English Dub Cuts & Changes
Note: All characters are listed in order of their first appearances in the episode. The time they appear is the time from the Japanese dub.