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Samuel Brent Oscar "Sam" Riegel is a voice actor for the English dubs of the Yu-Gi-Oh! anime. He is sometimes credited as Sam Regal, Sam Brent Regal, or Jack Lingo. Sam's roles in the anime series are relatively minor and was often recasted in recurring roles due to scheduling conflicts, as he commuted between New York and Los Angeles for work at the time. He is also mostly known for being the english voice actor of Nick Wright (Phoenix Wright Ace Attorney) and Donatello (Teenage Mutant Ninja Turtles (2003)).
Riegel's first major role was portraying Tristan Taylor, before being replaced by Greg Abbey in episode 11. Additionally, he was the original voice of Para, speaking in his debut episode and the major recurring role of Rex Raptor until episode 145, when he was replaced by Sebastian Arcelus. He later provided the voice of Arkana, this time for all of his appearances.
Riegel provides the voice of Radley in Yu-Gi-Oh! 5D's.