'The Originals' season 3 episode 21 spoilers: Marcel becomes a super-Original in 'Give 'Em Hell Kid'?

Marcel's (Charles Michael Davis) repulsion towards the Mikaelsons born out of the vampire family's failure to save Davina (Danielle Campbell) puts them all in his crosshairs in another epic installment of "The Originals" season 3.

In episode 21 titled "Give 'Em Hell, Kid," Marcel makes sure that the Mikaelsons pay for what they have done, or more accurately, what they haven't done after letting Davina die (that's how it was in Marcel's eyes).

The promo for the penultimate installment of "The Originals" season 3 teases that Marcel is now hell-bent on revenge and has declared Elijah (Daniel Gillies), Freya (Riley Voelkel) and Klaus (Joseph Morgan) his enemies.

He also made sure Klaus knew that he lost all the respect he had for him. What's worse is that Marcel is about to make himself a far more dangerous threat with the serum that Freya took from Aurora.

It was given to him by Vincent (Yusuf Gatewood) in last week's episode of "The Originals" season 3. If Marcel decides to take it, he should become a super-Original.

Fuelled by his hate, Marcel will undoubtedly do significant damage and the Mikaelsons might have to mourn another loss after watching Cami (Leah Pipes) and Davina die.

As if they don't have a lot on their hands already, the Mikaelson family is also set to meet a new and powerful enemy. This force appears in one of Freya's visions, allowing them to know what they are up against.

This new menace won't be fully unmasked until "The Originals" season 3 finale though. If the description for the baddie on the way is any indication, Klaus and the others are in serious trouble.

This entity is hailed "the one person that could lead to their ultimate demise." According to Davis during a chat with SheKnows, there will be more "big deaths" coming, and the new enemy could be responsible.

"There've already been a lot of deaths, who more can we kill off? But that's the thing, the people are still at odds in New Orleans, the families and everyone with Lucien and other characters. That's the surprising thing. It's like Clue. Who's next? Who could we afford to lose?" Davis said.

"The Originals" season 3 episode 21 "Give 'Em Hell Kid" will air Friday, May 13 at 9 p.m. EDT on The CW.

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