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King of the Castle is the eighty-fifth episode of Ben 10.
Ben, Gwen and Grandpa Max travel to Castle Bishopbrook to visit a distant royal relative.
- Thornblade, Undertow, and Dark Matter make their debut.
- The Forever Knight reaches out to Kevin, but Kevin turns him down.
- It's revealed that the Tennysons have royal blood.
- Ben discovers that Kevin has aliens similar to his original playlist and a quick-switch feature.
- Ben is aware that he no longer has access to both Wildvine and Grey Matter.
AntiTrix Alien Debuts
- Thornblade (first appearance; dopplegänger of Wildvine)
- Undertow (first appearance; dopplegänger of Overflow)
- Dark Matter (first appearance; dopplegänger of Grey Matter)
- This is the first time in the reboot series where quick-switching is intentionally used.
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