El Diablo

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*Note: His image is distorted, I will try to fix it ASAP.

El Diablo is a new alien who is available to Ben in the series Ben 10: Ultimate Alien MEGATRIX. El Diablo was unlocked in Area 51 is Back when prisoner #944 escapes. El Diablo has so far only appeared as a hologram and has not yet made a proper on-screen appearance.