4 Juniors, also known as 4 Plus was a theme introduced in 2003 by LEGO that targeted children of four years old or more. It was a successor to the Jack Stone theme and used regular LEGO bricks but came with a different kind of minifigure that was larger then the standard minifigures. The sets tended to have a small number of larger pieces, in order to be easy to put together. The 4 Juniors theme consisted of Pirates, City and Spider-Man subthemes.
2003 LEGO Sets
2003 brought challenges but also key innovations that shaped LEGO’s revival. Realistic skin tones were introduced for licensed themes, while yellow remained standard for original ones. Clikits, Designer, and expanded Sports lines reflected diversification efforts, and 4 Juniors replaced Jack Stone for younger builders. World City modernized the classic Town setting. Though financially turbulent, LEGO’s design experimentation and new audience focus paved the way for its recovery.