Alpha L. Walker, 38, and Walker's girlfriend, Tamara
Diaz, stepped in and pleas of not ashamed on during their first court present in
Los Angeles.
Walker is accused of trying to extort the Grammy-winning musician over information they claimed would embarrass him.
The suspects allegedly tried to obtain $5m (£3.1m) from the Superstition singer and said they could go to the media with a story of incest, it was reported.
They were arrested in May after receiving a lowered sum of $10,000 (£6,377) from Wonder's lawyer in a police sting where undercover police officers posed as representatives of the musician.
Walker was on probation at the time of his arrest after pleading no contest to grand theft in May 2011.
Walker's lawyer said his client simply made a movie about his own life and his actions are protected by freedom of speech laws in the US.
The pair will return to court for a pre-trial hearing.
Walker is accused of trying to extort the Grammy-winning musician over information they claimed would embarrass him.
The suspects allegedly tried to obtain $5m (£3.1m) from the Superstition singer and said they could go to the media with a story of incest, it was reported.
They were arrested in May after receiving a lowered sum of $10,000 (£6,377) from Wonder's lawyer in a police sting where undercover police officers posed as representatives of the musician.
Walker was on probation at the time of his arrest after pleading no contest to grand theft in May 2011.
Walker's lawyer said his client simply made a movie about his own life and his actions are protected by freedom of speech laws in the US.
The pair will return to court for a pre-trial hearing.