|This article belongs to the Reboot Continuity|
Which Watch is the twenty-first episode of Season 3 of Ben 10.
After a battle with Kevin gets cut short, Ben turns his attention to one upping Gwen at Space Camp. But, when Kevin returns with his sights strangely set on his cousin, our hero must uncover who is really behind it all, Charmcaster!
Antitrix Alien Debuts
- Quad Smack (first appearance; doppelganger of Four Arms)
- Hot Shot (first appearance; doppelganger of Heatblast)
- Monster Kevin (first appearance; doppelganger of Amalgam Ben; combination of Kevin, Bashmouth, Quad Smack, Undertow, Wreckingbolt, Crystal Fist, Bootleg, Thornblade, Skunkmoth, Dark Matter, Rush, and Hot Shot)
|Tara Strong||Ben Tennyson|
|Montserrat Hernandez||Gwen Tennyson|