Adda is a character on ABC's Once Upon a Time. He is portrayed by Jason Simpson.
Adda and Merlin stumble across the Holy Grail. However, when Adda tries to drink from it, he disintegrates into ash. Merlin proceeds to try his luck with the Grail, and fortunately he survives, while also gaining magic and immortality.
- Adda is the first known person to perish at the hands of the Holy Grail. Sir Kay also perished when trying to obtain it, although this was after the Grail was reforged into Excalibur.
- S5, E07: "Nimue" (flashback)