What 10 year old provided the voice of title character Junior Healy in the USA Network's animated series "Problem Child", and was replaced by  Blake Ewing during its 5th season?
Blake McIver Ewing Blake McIver Ewing (born March 27, 1985), also known as Blake McIver and Blake Ewing, is an American singer-songwriter, actor, and pianist. He was known for playing Michelle's friend Derek on the sitcom "Full House". Ewing also portrayed the role of Waldo in the 1994 feature film version of "The Little Rascals", and voiced Eugene on "Hey Arnold!" during its 5th season (replacing Benjamin Diskin, Jarrett Lennon and Christopher Castile). He is currently one of the hosts of the Bravo series "The People's Couch".
The Backyardigans The Backyardigans is a CGI-animated musical TV series created by Janice Burgess. It is a co-production of animation studio Nelvana and Nickelodeon Animation Studios. The series debuted on October 11, 2004 and ended on May 31, 2010. The show airs on Treehouse TV in Canada. In 2015, the first season was included as part of Nick Jr.'s Noggin app, a mobile application featuring episodes of older Nick Jr. programs.