And Then There Were 10 — [s1e1]

"And Then There Were 10" serves as the 2005 Ben 10 series pilot, introducing the Omnitrix and the "Tennyson Trio" dynamic while establishing crucial backstory for Ben and Grandpa Max. The episode follows Ben Tennyson discovering the alien device and fighting Vilgax's drones, setting up the series' long-term cosmic narrative. For a detailed breakdown of the episode, visit the Ben 10 Wiki .