An Old Enemy

An Old Enemy is the second episode of Ken 10: Another hero.

Plot
Darkstar, Ben's old nemisis returns to get revenge.

Characters
Ken

Ben 10,000

Kevin

Delvin

Gwen

Gwendolyn

Rex Sazalar

Optimus Prime (first reappearance)

Villains
Darkstar (first reappearance)

Mike (first appearance)

The Lucubra (flashblack)

Aliens used
Aliens used by Ken:

Humungosaur

Goop

Waterhazard

Heatblast

Diamondhead

Ghostfreak

Aliens used by Ben:

NRG

Swampfire

Cannonbolt

Ultimate Cannonbolt

Waybig

Clockwork

Alien X

Diamondhead