Episode 01 :- Vengeance of Vilgax, Part 1
In Episode 01 , Vilgax defeats the ten Super heroes of Universe and drain the powers of them into himself to become more powerful .  Next planet is earth and its hero , Ben Tennyson , Vilgax challenges him for earth Psyphon shows up on earth and summons vilgax . Kevin tries to hack omnitrix so that Ben can control Omnitrix fully but omnitrix gets broken and four aliens are released from Omnitrix leaving Kevin a monster with a combination of metals .

Episode 02 :- Vengeance of Vilgax, Part 2
In Episode 02 , Ben sets to recapture its aliens Goop , Spider-monkey and Chromastone before going to face Vilgax . However his biggest and powerful alien way big is still on rogue Ben uses his different forms but gets defeated every time then Gwen and Kevin takes way big with them Ben scans him and presses to transform into Chromastone . Vilgax destroy Chromastone and announces him winner but Ben reappears with Diamondhead and defeats Vilgax .

Episode 03 :- Inferno
n Episode 03 , Ben , Gwen and Kevin find out a strange man that lives in underground and finds out strange activities . they find that Vulkanus is planning to erupted the earth center to make atmosphere as  its homeland .

Episode 04 :- Fool's Gold
In Episode 04 , An alien who comes on earth on a festival every year asks Ben to locate his missing friend who was missed after two days . those alien are gold producing aliens so the chief of town capture one alien for his own purpose .

Episode 05 :- Simple
In Episode 05 , An Alien girl asks for Ben help to resolve the conflict between the two groups of her planet on the arrival of Ben , Kevin find out that Argit is doing a great business by selling weapons , he joins Argit to make profit Ben kidnaps the leader of both sides and force them to join hands both groups become one when ben as way big destroys the statue of their planet leader .

Episode 06 :- Vreedle, Vreedle

Episode 07 :- Singlehanded
In Episode 07 , A bounty hunter who chases Ben for his omnitrix cut the left hand of Ben to get the omnitrix Ben goes to Null void while his hand is on earth captured by that Hunter . Ben faces many problems there but Kevin takes him back by the axe of hunter .

Episode 08 :- If All Else Fails
In Episode 08 , Ben and his team has to destroy a robot like Highbreed alien which accidentally turns  on and move towards the city to destroy the city .

Episode 09 :- In Charm's Way
In Episode 09 , Charmcaster returns to take revenge and she disguises herself as an another girlso that she can trap Kevin . she is successful in doing so and using Kevin charmcaster wants to defeat Gwen.

Episode 10 :- Ghost Town
In Episode 10 , Vilgax crashes on earth after the defeat by Ghost Freak , Ben’s previous alien. Vilgax takes help from Ben to freed his people from the control of Zs’skayr who has taken over all the planet.

Episode 11 :- Trade Off
In Episode 11 , Kevin and Darkstar both goes to a planet to retrieve an artifactwhich is so powerful that it can cure both . They ends up everything right but Darkstar wants more power so he takes the power from Ben and Gwen , However Kevin stops him but regaining his last form and powers.

Episode 12 :- Busy Box
In Episode 12 , Ben , Gwen and Kevin comes across a strange box that totally copies them even with their powers and structure Ben and his team goes in a big trouble with fighting the busy box which was so powerful .

Episode 13 :- Con of Rath
In Episode 13 , While the Ben is busy in settling an intergalactic peace mission , his omnitrix malfunctions and turns him into a aggressive alien and ruthless alien named as ‘Rath’ due to which things mess up.

Episode 14 :- Primus
In Episode 14 , Ben during a fight starts malfunctioning and transports Ben , Gwen and Kevin to another planet where the omnitrix returns to its makes Azmuth and Ben sees Azmuth fighting Vilgax using Omnitrix .

Episode 15 :- Time Heals
In Episode 15 , Gwen has to stop the Omnitrix experiment due to which the present time has become worst where Ben is defeated , Kevin is Kidnapped . She travels back in time and stops that experiment and saves thje earth from upcoming disaster.

Episode 16 :- The Secret of Chromastone
In Episode 16 , Ben has been felt to sick and his old friend Tetrax arrived to use omnitrix to save his home planet . He again takes out chromastone from the Diamondhead and send him to save his planet but vilgax is behind Tetrax and he does not want to let that happen .

Episode 17 :- Above and Beyond
In Episode 17 , The Plumber’s helpers went to plumber station to rescue Max but they confronts Ben with a insane mood who wants to kill all of them . The helpers teams up and defeats Ben Tennyson finally and at last it was revealed as their test .

Episode 18 :- Vendetta
In Episode 18 , Kevin confronts the alien who was responsible for the death of his father as told by Max Tennyson Kevin wants to take revenge by itself .  He sends Ben and Gwen away from the matter and kill that Alien taking the key for which alien killed his dad.

Episode 19 :- The Final Battle, Part 1
In Episode 19 , Vilgax and Albedo teams up to defeat Ben and away his omnitrix . They plan to kidnap Kevin and Gwen so that they can take omnitrix in return .Albedo and Ben fight but Ben ends up giving his omnitrix to the village

Episode 20 :- The Final Battle, Part 2
In Episode 20 , After losing Omnitrix , Ben and his team again goes to the village ship as Vilgax betrayed Albedo , Albedo for his ultimatrix and destroy the omnitrix Vilgax had Ben and Vilgax had fight underwater where his ship is crashed resulting in defeat of Vilgax and Ben wins again.