Plot
After the explosion, Gwen emerges from the rubble thanks to being protected by an energy shield. Then Spidermonkey and Chromastone emerge from rubble and leave. Ben, Gwen, and Goop emerged. The aliens leave and they find Kevin who is now a mixture of things he had absorbed previously. Ben eventually notices that Chromastone, Goop, Spidermonkey, and Way Big are missing from the Omnitrix. Azmuth suddenly appears as a hologram and is upset at the turn of events. He told Ben he had 24 hours to find the alien forms and recapture them so he could regain their powers. Outraged with the disaster, Azmuth also tells Ben that he'll never help him again.
Ben is upset and Kevin tries to revert to normal by absorbing Gwen's skin, but to no avail. Kevin then decides to use the Plumber's badges to track down the alien samples. The trio find Chromastone causing havoc in the pier and Kevin attacks. He discovers his new morphing powers and uses them to fight Chromastone. Ben tries to become Humongousaur but becomes Upchuck and captures Chromastone after Kevin knocked him out. The trio continues to seach for the aliens and Ben wants to drive, upsetting Kevin. Gwen uses her laptop upgraded by Plumber technology to reveal Vilgax had beaten 10 heroes and now had their abilties. Ben is not worried but blames Kevin for the Omnitrix problems as Spidermonkey stops them using his webbing fluid and uses a web to take Gwen.
Being freed from the web
Ben becomes Brainstorm and frees Gwen, and then fights Spidermonkey while Kevin uses his new powers to free Gwen from the webbing. He then absorbs Spidermonkey after Gwen reminds him and the trio continues their drive. The trio goes into the sewer and Goop shows up surrounding Ben. Goop defeats Kevin and Gwen with ease as Ben becomes Swampfire to battle Goop. The battle is then taken above ground after Swampfire's flames ignited methane in the sewers, causing a huge explosion. Goop is finally re-absorbed after a long fight.
The trio later goes after Waybig having only an hour before Ben had to battle Vilgax. Max contacts the group telling them Vilgax is one of the Plumber's enemies and he is getting into gear, wanting to fight him. Ben decides he would have to fight Vilgax without Way Big and he decides to go face Vilgax to stall. An hour later a massive newscrew has gathered and Psyphon appears. The battle is going to be seen on all planets and Vilgax's army surrounds the sky, going to destroy Earth if he won. Everyone on Earth watches and Ben arrives as Jetray, wanting Vilgax's team to be his servants after he won.
Vilgax appears and a fight ensues. Ben fights Vilgax as Jetray
, Big Chill, and then Humongousaur. But Vilgax is too strong and is going to kill Ben when Kevin and Gwen arrives with Way Big. Ben re-absorbs him and tries to use him but instead becomes Chromastone. The fight ends as Vilgax kills Ben with his sword just as Max arrives and Kevin and Gwen shares tears. Psyphon appears and takes the Omnitrix and Vilgax was going to absorb the Omnitrix's power.
The pieces of Chromastone come together to form Diamondhead who easily man-handles Vilgax and Max approaches telling him the rules, as Vilgax is not allowed to come back to Earth and attack it again. Vilgax is upset but leaves and promises to get his revenge on Ben if he ever leaves Earth.
Ben was upset that everyone knew his secret and Max revealed he used his plumber tech to block half the fight and Ben had no idea what happened to Chromastone. He claimed the watch was broken and he decided teamwork was the best option regaining his friend's trust after saving the Earth.
Major Events
- Ben has damaged the Omnitrix and loses Azmuth's trust.
- Kevin gets mutated for the second time.
- Chromastone reforms into Diamondhead after Vilgax destroyed Chromastone.
- Vilgax loses the Conqueror's challenge and is banned from Earth.
Characters
Villains
Aliens used
- Upchuck (Accidental transformation; selected alien was Humongousaur)
- Brainstorm
- Swampfire
- Jetray ( Defeated)
- Big Chill ( Defeated)
- Humongousaur ( Defeated)
- Chromastone (Accidental transformation; selected alien was Way Big)
- Diamondhead (Alien Force Debut)
Quotes
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Ben: Here Chromastone...good Chromastone.(whistles)
Ben: Eww smells like a sewer down here.
Gwen: I'm not kidding Ben, no more sewer jokes.
Ben: Smells like a plan to me. (Gwen hits him) Ow!
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Errors
Finger error
- When Diamondhead shot some diamonds, only 3 fingers were there instead of 4.
- When Ben and Vilgax were fighting, three times Vilgax was rotated.
Trivia
- Ben (as Big Chill) Mentions "A nice refreshing dip on a hot summer day.", this could mean that Alien Force has now marks that 5 year anniversary of when Ben got the omnitrix. It also implies that Ben was in 9th grade and that Alien Force is rather 4 years and a couple of months past the original series rather than 5.
- First time in both Ben 10 series we see Upchuck's transformation.
- In the Australian Cartoon Network both parts of "Vengance of Vilgax" were joined together.
- When the aliens are shown on the Omnitrix map, Alien X, Cannonbolt, Upchuck and Lodestar aren't shown.
- Even though Vilgax was to never come back to Earth again by the rules of the Galactic Code of Conduct, he kept coming back and attacking the Tennysons.
- Kevin remains mutated until The Final Battle: Part 2 where Max tells him that the energy from the Omnitrix kept him in that mutant form.
- This two part episode aired on the eighth anniversary of 9/11 attacks.
- It is revealed that Gwen is afraid of spiders.
- Ben may have Diamondhead back, but this time Diamondhead has a new form and is stronger than it was before. Diamondhead still has the arms and face of its original form but it now has the body of Chromastone.
- This episode makes two allusions to urban legends. First, when Spidermonkey goes after Gwen, Kevin says it'll lay eggs in her head, then when the eggs hatch, they'll eat her brain. Second, Ben says that, in the sewer, there are alligators that people flushed down the toilet when they were babies.
- The Casey-Kelly Accords are a reference to Joe Casey and Joe Kelly, two of the creators of the Ben 10 saga.
- It is revealed that Kevin is afraid of alligators.
- While fighting Spidermonkey, Ben (as Brainstorm) stuck to Spidermonkey's net. Spidermonkey came closer to Ben. Then, Gwen told Ben to capture it. It is strange that Brainstorm (havin high intelligence) couldn't think of this.
- After Ben noticed that Way Big was was also gone, he said "And how did he get out of here?!", and Way Big Escaping could explain the impressive destruction of the garage.
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