The last episode hasn't aired yet.
If you go to youtube look up Ben 10 alien force season 3 you will see diamondhead chromastone cannonbolt and more
Phineas and Ferb find the alien named "Meap" in the season 2 episode "The Chronicles of Meap." P.S If you like Meap, also check out the season 3 episode "Meapless is Seattle." It is better (in my opinion) than the first Meap episode.
you can find ben 10 alien force vilgax attacks for ps2 at gamestop and walmart
She technically died in season 3 episode 22 but you dint find out till season 4 episode 1.
first season episode 38-39
Season 4, Episode 18.
Season 8 Episode 15
Season 6 Episode 16, in the end of the episode
Season 5 Episode 1: Everything on the line Season 5 Episode 2:Red skies in the morning Season 5 Episode 3:Stay focused or die Season 5 Episode 4:Put up or shut up Season 5 Episode 5:Long haul short fuses Season 5 Episode 6:Deadline
you find out in season 2 in the season finale :)
The last episode in Season 6 Remember Me as a Time of Day Episode 24 - Season 6
Season 4 Episode 11