The episode begins with Ben being attacked at night by what appears to be , a former Plumber and father of Ben's old friend, Elena. The team soon learns that Victor has actually been dead for a year, leading them to suspect the return of the Nanochip Queen .
: Watching the movie Ben 10: Alien Swarm is highly recommended before this episode to understand Ben and Elena's history and the origin of the Nanomech transformation.
: This episode retcons some elements of the movie, revealing that the "Queen" defeated previously was likely a decoy and that Elena has become the true host for the Hive.
: Ben manages to rescue Julie and defeats the swarm, but Elena escapes, leaving her future role as a friend or foe ambiguous. Key Episode Details Air Date : March 18, 2011.
" Revenge of the Swarm " is the in the animated series Ben 10: Ultimate Alien . It serves as a canonical sequel to the live-action movie Ben 10: Alien Swarm , reintroducing characters and plotlines centered around the Hive nanochips. Plot Summary
: Julie is kidnapped by a swarm of microchips while waiting for Ben at a Burger Shack.