And Then There Were 10...
Don't Drink the Water
It might be the episode were vilgax appears or tummy trouble.
http://watchben10.net
ben 10 aliens unleashed or ben 10 evolution
Perhaps, if the writers and developers have her arranged for a return in an episode before the Diagon event
http://www.watchcartoononline.com/ben-10-season-4-episode-9
It is in Ben 10 season 4 episode 8 Hope that helped (what I mean is when Ben and Gwen are little)
Ben 10 Alien Force Episode 14: Darkstar Rising
no sorry but there is ben 10 alian force
watchben10.net
Ben had a car in Ben 10 Alien Swarm (Season 3 Episode 10).. But in further episodes it was not shown. Ben has got a car from begining of Ultimate Alien Series.
He's in Ben 10:The negative 10.he's also in the beginning of Ben 10 Secret of the Omnitrix
Ben 10 Aliens Force has not yet come to a series finale episode.
"The Ultimate Enemy Part 2" is the Final episode of Ben 10 Ultimate Alien.
Ben 10 Ultimate Alien, Season 1, Episode 1 "FAME".. She kisses him on cheek.
will there be a ben 10 episode 50
Ben 10 Alien force The final battle part 2
you can go on youtube.com to watch all the ben 10 episodes