"The Underground Maze!" (迷宮！ブラックダンジョン!!, Meikyū! Burakkudanjon!!) is the eighteenth episode of Beyblade Burst Evolution, the second season of Beyblade Burst. It first aired on July 31st, 2017 on Japan and later aired on February 17th, 2018 in the United States.
- Daigo takes on Black Eye and defeats him, causing Black Eye to be kicked out of the Snake Pit.
- Cuza takes on Gray Eye and defeats him, causing Gray Eye to also be kicked out of the Snake Pit.
- Valt takes on Azure Eye, but because Valt still hasn't unlocked the hidden powers of his Genesis Valtryek V3 6Vortex Reboot, Azure Eye is able to take the lead in their battle.
- Black Eye
- Daigo Kurogami
- Valt Aoi
- Cuza Ackermann
- Carl (Cuza's Bird)
- Rantaro Kiyama
- Wakiya Murasaki
- Gold Eye
- Silver Eye
- Red Eye
- Boa Alcazaba
- Gray Eye
- Azure Eye
- Arthur Lawrence (Flashback)
- Shadow Doomscizor 2Vortex Hunter (Black Eye's)
- Doomscizor D3 2Vortex Hunter (Daigo's)
- Shadow Cognite 6Meteor Trans (Gray Eye's)
- Cognite C3 6Meteor Trans (Cuza's)
- Shadow Valtryek 6Vortex Reboot (Azure Eye's)
- Genesis Valtryek V3 6Vortex Reboot (Valt's)
- Kerbeus K2 Knuckle Unite (Arthur's; Flashback)
- Daigo Kurogami (Doomscizor D3 2Vortex Hunter) vs. Black Eye (Shadow Doomscizor 2Vortex Hunter) = Daigo & Doomscizor (2-1)
- Round 1: Black Eye & Shadow Doomscizor (Ring-Out Finish; 1pt)
- Round 2: Daigo & Doomscizor (Burst Finish; 2pts)
- Cuza Ackermann (Cognite C3 6Meteor Trans) vs. Gray Eye (Shadow Cognite 6Meteor Trans) = Cuza & Cognite (2-0)
- Round 1: Cuza & Cognite (Burst Finish; 2pts)
- Valt Aoi (Genesis Valtryek V3 6Vortex Reboot) vs. Azure Eye (Shadow Valtryek 6Vortex Reboot) = Battle continued in next episode
- Round 1: Azure Eye & Shadow Valtryek (Ring-Out Finish; 1pt)
Special Moves Used
- Double Strike (Doomscizor D3 2Vortex Hunter)
- Double Strike (Shadow Doomscizor 2Vortex Hunter)
- Hunt Launch (Doomscizor D3 2Vortex Hunter)
- Hunt Launch (Shadow Doomscizor 2Vortex Hunter)
- Flying Double Strike (Doomscizor D3 2Vortex Hunter)
- Gravity Boost (Cognite C3 6Meteor Trans)
- This episode marks the first time that Rantaro is seen wearing his jacket.