Grievous' Apprentice

Greivous' Apprentice is the eighth episode of Ben 10: Unlimited Force.

Summary
Ben's sister, who he hasn't seen since he was eight, is visiting, and he wants to make up for lost time. However, she has a new job that she might want to keep a secret.

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Vanessa "Ven" Tennyson

Villains

 * General Grievous

Aliens Used

 * Nanomech (activated by Samantha)
 * Jetray
 * Fasttrack

Trivia

 * Ben had never mentioned having a sister in the previous series.