Mark returns from holiday to find that Ace plans to get back home. When Lord Fear starts rebuilding his army, how can Mark fight him alone?

Lord Fear's army continues to grow as Lady Illusion finds another piece of the Amulet. Chuck receives an SOS from Ace in the Sixth Dimension.

Mark's plans to spend time with Kat are ruined. Chuck relies on Ace as he is lured into a trap, while the Master Programmer's creation lurks in the shadows.

Chuck struggles to find Sparks. Kilobyte gives Lady Illusion a new power as part of a plan to infect Ace with human emotions.

Ace is unable to control his anger after being infected with human emotions by Kilobyte. Mark and Chuck can't help as they are sent on a school trip.

Chuck is sucked into the game by the Master Programmer and it’s up to Ashley to help him. Ace's confidence is shaken as he and Mark are captured by Kilobyte.

Mark takes his driving test. Meanwhile, Mr Cheseborough is duped into giving Lord Fear a new secret weapon when he is told lies about Ace.

Mark takes it into his own hands to stop Rotgut but ends up destroying Cheseborough's lab. Ace's emotions continue to get the best of him.

Mark has a tough choice when Samantha returns for a visit. Lady Illusion flees from Lord Fear, but Sparx suspects it's a trick.

Chuck gives the Lightning Knights an upgrade which makes them invulnerable. Mark is jealous of his popularity but comes to the rescue when Sparx and Ace are wounded.

Chuck discovers that Rick created Ace Lightning, and that he is the Master Programmer. Rick explains why he created Kilobyte – but then Kilobyte goes rogue!

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