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|Comedy and Tragedy|
|Powers and Abilities|
|Abilities|| Enhanced Agility|
|Relatives||Each other (twin brother)|
|Alias||Happy and Sad|
|First Appearance||Return to Forever|
In An American Benwolf in London, they failed to keep an eye on Wes Green. Later, they helped Chadwick to find Excalibur in London. When their lives were at risk due to a now mutated Chadwick on a rampage causing a flood in the underground vault, the Twin Knights and Sir Morton allowed a truce with Ben's group in order to find a way to escape but promised they'd fight again another day once they got out alive.
Ben 10: Omniverse
- According to Derrick J. Wyatt, the Twin Knights are called Happy/Sad or Comedy/Tragedy due to their masks.