What's the Big Idea? is the prototype of Sid the Science Kid. Not much is known about What's the Big Idea outside of pbs (studio that created Sid the Science Kid) all is known that the show contained a young boy named Josh, who would later be named as Sid. Later on, the title became a segment in Sid the science kid, by the same name.
Jim Henson (the creator) said it would be a stop motion animation, not computer animated but he has been simerlar with it and does not talk about it.