Duped (Ben 10: Ultimate Alien)

Duped is the second episode of the first season of Ben 10: Ultimate Alien, and the second episode overall.

Plot
Ben has a case to solve, his girlfriend's tennis game to watch, and he wants to see a movie, but he only has time for one - so he decides to enlist the help of Echo Echo.

Why It's Duped

 * 1) It's just a very long and boring filler episode, and has nothing to do with the main plot, which was the Aggregor/Andromeda aliens arc.
 * 2) Ben and Gwen are very unlikable in this episode, as they behave very immaturely and annoyingly.
 * 3) Plot Hole: For some reason, the Echo Echo clones can still transform into aliens, even though the clones are aliens. How can they do that?
 * 4) The Forever Knights were shoehorned in just to add some type of villain, and they are very boring in this episode.
 * 5) Speaking of the Forever Knights, even though they are attacking a museum, Gwen still makes Ben go to the tennis game instead of battling them. SHE IS LETTING THEM ATTACK A MUSEUM, STEAL SOME IMPORTANT ARTIFACTS AND IT IS ALL HER FAULT.
 * 6) Ben was also rather dumb, as the arrogant Ben went to Julie's tennis match while the tender Ben went to the museum to fight them forever knights. They should have switched places.
 * 7) Also, even though the three clones turned into aliens, they are weaker than before. This is never explained why they are weaker.
 * 8) Bad Ending: Julie tries to make up to Ben by wanting to watch the Sumo slammers movie with him, but Ben says that he already saw it. This makes Julie and Gwen mad and they storm off.

Redeeming Qualities

 * 1) Kevin (and to some extent, Ben) is still a likable character.
 * 2) Some memorable and funny moments, like the Rath intro, Humungousaur's opera voice, and "It's Slammer Time!"
 * 3) The concept of Ben using Echo Echo to make duplicates of himself is interesting.
 * 4) The animation and voice acting is still great as usual.