A Cell Jr. is a blue, child-like version of Cell. Cell spawned seven of these creatures during his battle with Son Gohan to battle the spectating Z Fighters in an effort to make Gohan angry. When Gohan finally did snap, he dispatched them very quickly. They have a vocabulary limited to "Ki!" and "Yah!" in the Japanese version of the anime, but both the FUNimation and Ocean Group dubs of the series taunt the Z Fighters with child-like phrases.

They appear as playable characters in the Dragon Ball Z: Budokai series and the Dragon Ball Z: Budokai Tenkaichi series.

In the manga and anime Cell creates seven Cell Jrs. However in the anime episode number 186 (English dubbed The Unstoppable Gohan) Gohan destroys eight Cell Jrs.