Ryan Walker mysteriously awakens MECH-X4, a giant robot built to defend Bay City against impending doom. When monsters begin to descend, Ryan recruits his two best friends and his brother to help pilot the robot that is their only hope of saving their town from mass destruction.
Ryan's attempt to level up at his new school is interrupted when the team must stop a super-powered enemy.
An item of immense power rests under the Bay, as does a terrifying new monster.
Ryan and the team must fight off a zombie horde.
Ryan is bombarded by visions of Harper. If Harper is still alive, Ryan must make a difficult choice: save him, or destroy him once and for all?
Ryan finally gets a lead on his biological father, Randall, only to find him in mortal danger and must race against time (and a collapsing mountain) to save him.
When a new monster creates a city-wide blackout and disables the MECH-X4, the team must figure out how to get the robot working again to stop the beast from completing its mission.
Ryan and Mark's fun day with their Dad is interrupted when a fighter drone created by Harris is mysteriously reprogrammed to destroy Ryan.
The team has their first real battle with Traeger while Leo is confronted with his past.
Veracity's first mission with the team could be her last when her attempt to give Mech-X4 a flight mode goes terribly wrong.
Ryan and the team take MECH-X4 to the Arctic for an epic showdown with Traeger.
Mark and others find Ryan in the top half of the robot. He is alive but very weak.
Ryan meets more of Leo's technopathy test subjects, including his birth mother.
Grace might relocate the family to Miami.
When the team split apart as Grace contemplates leaving Bay City, Traeger makes his move.
After a successful mission, the team finally gets a little chill time in Mech-X until they find a bomb on the X-Deck!
A traitor on Mech-X4 picks off unsuspecting team members one by one.
Ryan, Spyder, and Veracity attempt to sneak into a hospital to get the materials they need for a secret mission.
Ryan and what's left of his team take on Traeger and a traitor in Brazil.
With the world falling one city at a time, Ryan and the team retreat to the Thirty's secret farm.
A super-charged Mech-X4 races around the world to defeat Traeger's beasts, and Ryan must make one of his toughest decisions yet: save his friend or save the world?
