Jarrett Lerner Books in Order

Ken receives a robot secretly built by his friend Dan and imagines a helpful new companion. But the machine's ravenous appetite and explosive behavior spread through the other EngiNerds' robots, leaving the friends to contain a growing disaster.

Geeger, a robot designed to consume unwanted food, starts attending school with human children because he wants friends. His unusual appetite causes mistakes in the classroom, making his first day a challenge in fitting in and controlling impulses.

This activity book invites children to complete comics, respond to writing prompts, and experiment with drawing. More than a hundred open-ended exercises encourage them to develop stories, discover their own styles, and put their imaginations on paper.

The EngiNerds search for one last elusive robot after their earlier mechanical troubles. Their hunt is complicated by gadget-loving newcomer Mikaela, who claims to have evidence that aliens are already present in the friends' town.

A second collection of creative prompts encourages children to write stories, finish six-panel comics, and try drawing techniques. Its open-ended activities offer room to invent characters and scenarios while practicing different ways to express an idea.

When classroom hamster Fudge disappears, some classmates suspect Geeger may have accidentally eaten him. With help from his friend Tillie, the robot searches for the missing pet and tries to prove that his appetite is not responsible.

A bean, chip, tomato, and wedge of cheese form the Hunger Heroes, traveling in a taco hovercraft. Their first mission is helping a schoolchild who missed breakfast and faces a demanding day without permission to eat snacks.

An extraterrestrial warns the EngiNerds that Earth is scheduled for destruction and replacement with a giant intergalactic billboard. The friends, aided by an exceptionally clever dog, must combine their skills before time runs out for their planet.

Geeger wants to help his best friend Tillie, who is having a miserable day. When snacks and jokes fail to cheer her up, the robot must find another way to support her and bring back her smile.

Will hides beneath baggy clothing, ashamed of his body and fearful of what classmates think. His attempts to become thin grow increasingly unhealthy, while a new friendship with skateboarder Markus offers another way to understand himself and seek acceptance.

Nat the Cat wants to nap, but the narrator keeps interrupting his sleep and confusing what he says. This early-reader story turns their disagreement into a playful exchange, using simple language and repetition as Nat tries to rest.