It's hero time!.
The story takes place when Ben wakes up one morning to a loud sound outside so when he decides to go check it out he discovers that the alien device known as the Omnitrix is starting to act weird as he doesn't know that the night before a weird little bug had drains some of the energy from it and only left enough for Ben to transform into a few aliens but soon Ben along with his grandpa Max and cousin Gwen learn that the energy has turned into a type of crystal that can be put back into the Omnitrix but it going to be tough as many of their top enemies are also after the crystals so they must raise against the clock.
The game has a total onlly five aliens that you can play as which Heatblast and FourArms are unlocked at the beginning of the game while the other forms of Cannonbolt , XLR8 and Wildvine must be collected by defeating certain boss battles as each one of the aliens has a special power to master like XLR8 can speed through doorways that would close really quick when your not fast enough in your other forms , FourArms can move huge objects onto switches and Wildvine can switch from plant like orbs to reach higher areas but I will leave the rest up to you to find out as it's more fun to learn the stuff on your own sometimes.
Also to keep in mind that when you explore the different levels you will notice that there are certain places that you get go to only with a certain alien form as many of the secret areas usually reward you with a Sumo Slammer card as each level has three of them and also when you defeat enemies or destroy stuff you can collect DNA points that when you have have enough then you can unlock a few fighting move for one of your alien forms so try to unlock them all as some of them will really help you with the many enemies and bosses you will encounter in this game as many of the bosses are some of Ben's biggest enemies of the show like Vilgax , Kevin 11 and Dr.Animo as be sure to take them down just like in the show.
I really liked the series of Ben 10 and this is a good game to play if your also a fan of the series or just interested in trying out as it's got a little bit of stuff for new players of the series while also having something for the players that do know the series really well so give it a try.