With the newest up including Gargos to the cast, I learned that he holds a total of two Ultra Enders (I didn’t watch the stream as I’m going blind here) by holding Forward and pressing MP+MK accordingly during your Ultra while your Green Lifebar is still present.
It came to me by surprise of how cool it looked and how rewarding it was to pull it off.
Here comes the question, is it at all possible to assume that the rest of the cast will by getting one down the road at some point as well?