Spoiler-Safe Summary

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Androids 17 and 18 awaken independently and begin activating another android, defying their creator Dr. Gero. Trunks tries to stop them by destroying the lab, but the androids remain undeterred as they head toward Goku’s home, setting up an intense conflict.

Full Plot Summary

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Androids 17 and 18, the ones responsible for the future destruction of Earth, have finally awakened. The Androids are not following Dr. Gero's orders as they try to activate another Android - 16. Android 17 then kills Dr. Gero. Trunks, not wanting to stall long enough for the duo of Androids to activate 16, blows up Dr. Gero's lab. Atop the rubble, Androids 17 and 18 and Android 16, resting in his chamber, remain unfazed by the blast. The Androids awaken 16 and head towards Goku's residence to fulfill their mission.