Ben 10: Destroy All Aliens

The Omnitrix malfunctions because Gwen uses her pink magic to dismantle a robotic tank during a battle in Bellwood. While Ben is attached to the machine, Gwen's spell creates a pink mana imbalance in the device. This disruption ripples through the Omnitrix, causing it to malfunction throughout the story and eventually transform Ben's parents into aliens.

The Mechamorph, known as Retaliator, believes Ben is responsible for attacking him. The confusion stems from the fact that Azmuth, wearing the Waybig armor, attacked Ben earlier. Retaliator mistakenly thinks Ben sent the attacker and vows to eliminate all aliens unless Ben is handed over.

The ship logs mention an attack by evil Waybig that destroyed Azmuth's vessel, setting the误会 in motion.

When Ben is blasted into Earth's atmosphere as Diamondhead, he lands on Earth but the new Omnitrix function prevents him from transforming back to human form when the alien times out. He remains stuck in his alien state until rescued, which is why the Mechamorph is able to pursue him globally.

Azmuth's father is a Galvan who wields Mechamorph-type armor, which is the true identity of the Retaliator. When Azmuth explains the situation to Ben and Gwen, he reveals that his father is the one piloting the Mechamorph, adding a personal dimension to the conflict and explaining why the threat is so persistent.

While inside the Omnitrix, Ben, Gwen, and Tetrax attempt to reverse the transportation with Azmuth's father. However, the device malfunctions again during this process, accidentally transforming Ben's parents into Wildmutt and Heatblast. Azmuth later restores them to normal forms after resolving the main conflict.

During the ambush by the evil Waybig, Tetrax activates a new Omnitrix function. However, before he can fully explain it, the chaos forces everyone to fall back. The function appears to prevent the Omnitrix from reverting Ben to human form when an alien transformation times out, leaving him stuck in his current alien form.

The evil Waybig that attacks Ben, Gwen, and Tetrax is actually Azmuth himself wearing the Waybig armor. Azmuth was disguised as the villain, and when his ship was destroyed, he continued pursuing Ben under the mistaken belief that Ben was responsible for the attack. This revelation comes when they confront him inside the Omnitrix.

Azmuth disguised his ship as a semi-truck so he could track and repair the malfunctioning Omnitrix without drawing attention. The ship logs that Gwen and Max discover reveal this disguise was intentional, meant to allow Azmuth to observe Ben closely while working on a fix for the device.

Ben transforms into Fourarms and confronts the weaponized Mechamorph at Stonehenge. During the fight, the Mechamorph demands to know about the alien that attacked Ben. The battle tears across the globe, teleporting between Stonehenge and other landmarks, with the conflict damaging ancient sites as Ben struggles to contain the threat.

At the end of the movie, Ben, Gwen, and Grandpa Max encounter Doctor Animo while traveling on the road. This appearance signals that the family will face another villain in future adventures, setting up the ongoing cycle of alien threats that Ben must confront as the hero.