Will Marcel Drink the Serum?

After Freya was able to use her power to channel the prophecy in "Give 'Em Hell Kid," she and Elijah saw a new prophecy that showed Marcel drinking Lucien's serum and killing Elijah and Klaus. ... At the end of the episode it was revealed that Marcel actually took the magical serum the moment Vincent gave it to him.

Does Marcel die after taking the serum?

Yes, ANOTHER main character

And that's not all—we also said goodbye to Marcel (Charles Michael Davis). ... Marcel had taken the serum to turn into a super-beast so the Mikaelsons would think he died—but he is very much alive and definitely seeking revenge on the family.

What happens when Marcel drinks the serum?

Once Lucien consumed the serum, his death triggered the transformation into an Upgraded Original. In Give 'Em Hell Kid, Marcel would also transform into an Upgraded Original. Both instances, they were originally regular vampires before transitioning into Upgraded Original vampires.