The story follows Alex Darwin, an orphan whose mother died when he was a child and his father disappeared years later. During a run in with a Dopant (the same kind of Dopant from W) he obtains the X driver (Based on the W Driver) and becomes Kamen Rider Xtreme. He then sets out to take down Dopants wherever they emerge, and uncover the source of the beasts.
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Kamen Rider Xtreme provides examples of:
- Adults Are Useless: Averted, while the Riders are teenagers, the police force is quite competent and knowledgeable.
- After-School Cleaning Duty: Alex was forced to do this in episode 4.
- Beach Episode:
- Episode 6 takes place in a water park.
- The movie revisits it.
- Breaking the Fourth Wall: Done constantly by Madison in the early episodes.
- Breakout Character: Madison Tyler
- Brought to You by the Letter "S":
- The titular character Xtreme (Last letter of his real name is X as well)
- X Cyclone
- X Driver (Forms an X shape when activated)
- There are Xs incorporated into Xtreme's design, his weapons, and even his bike.
- Cats Are Mean: Cheshire
- City of Adventure: Ardent City
- Color-Coded for Your Convenience: All of the riders wear the color of their elements, Alex wearing the primary colors of his default form.
- Dreaming of Things to Come: Episodes 1 and 10 open with a dream sequence foretelling of a battle between four riders and a figure in shadows, the first of which ending with Alex proclaiming "This world is over."
- Elemental Powers: Each of the four secondary riders have elemental motifs and abilities, Xtreme himself even has elemental based memories of his own.
- Elemental Rock-Paper-Scissors: Most memories have an elemental base, which defines their strenghts and weaknesses.
- Evil Versus Evil: Fury vs META
- Finishing Move: Each rider has one tailored to their element, Xtreme having three.
- In the Name of the Moon: "Your rampage ends here!"
- Kick The Son Of A Bitch: In episode 21 Vainglory implants a highly corrosive spike into Fury's right arm that will eat away at him and eventually kill him. Fury is then kicked once again later that same episode when Carter hacks off that same arm before burning him to death
- Monster of the Week: The Dopants.
- The Omniscient Council of Vagueness: META
- Red Oni, Blue Oni: Tara (Red) & Shiore (Blue)
- Relationship Reset Button: Madison has all the events of the series erased from her memory at the end of episode 17. This including all her memories of Alex.
- Shout-Out: Several
- Alex and Madison bring up several existing anime shows, the big one being Puella Magi Madoka Magica, which is a personal favorite of the series' author.
- Gale's design is loosely based on the Ratoratah combo from Kamen Rider OOO
- Madison's line "She digs dirt" from episode 16 was a shout out to a fan.
- Rock's design is loosely based on Kamen Rider Birth from Kamen Rider OOO.
- Ryu-O's design is loosely based on Kamen Rider Kiva.
- Shiore bares a strong resemblance to Mizore Shirayuki from Rosario + Vampire.
- The gaia memories, dopants and Xtreme's base design are all heavily based on Kamen Rider W.
- Superhero Origin: The first chapter shows Alex gaining his powers.
- Ship Sinking: Several readers speculated that Alex and Sarah would end up together based on their interactions in the first few episodes, however several events proved this to be false. The two biggest being Alex and Madison becoming a couple and Sarah being revealed to have been in love with Madison the whole time. This of course coming only moments before Sarah's untimely end.
- Shoot the Dog: In episode 17 Alex delivers a killing blow to Sarah before she's completely consumed by the Reptillain Dopant memory.
- Signing-Off Catchphrase: "That's for me to decide and for you to find out when..."
- Later changed to "All will be decided when..." from Act Two onward.
- Act Three also added a question directed at one of the main characters to close out each episode preview.
- Swimming In It
- Title Drop: Alex receives the name Kamen Rider Xtreme during the act three finale.
- Technicolor Eyes: Carter (Red) & Tara (Violet)
- Weapon Specialization: Each rider has a unique weapon themed after their element.
- Carry a Big Stick: Rock
- Improbable Weapon User: Gale
- Heroes Prefer Swords: Ryu-O and Xtreme (Blade Kicker)
- Katanas Are Just Better: Yuki
- Wham Episode: Several, many of which being in immediate succession with one another.
- 14 The riders are brutally beaten by Fury, the police station is wrecked, and Alex, Kree and Madison are abducted.
- 17 Fury gains the powers of the dopants that Alex and company have defeated up until that point, Sarah turns into a rampaging monster, Madison gets stabbed by Sarah, Sarah is killed by Alex, Madison looses her memory of everything that's happened since the start of the series and Alex resigns from being a Kamen Rider.
- 18 Alex spends most of the episode depressed over what happened with Sarah and Madison. Shiore arrives in Ardent City and heavily damages Cole and Tara before making her move on Alex and threatening to kill him.
- 19 Shiore nearly kills Alex, Cole looses patience with Alex and hits him before chasing after Shiore with Tara, Ashley returns and Fury attempts to get Shiore onto his side.
- 20 Kree speaks to Alex directly, Alex reclaims his position as a Kamen Rider, Fury refuses to die, Shiore explains the origin of the gaia memories and the dark history they hold, Fury returns to META HQ and the Ryu-O memory and driver are given to Carter.
- 21 Vainglory implants a corrosive spike into Fury's arm that will eventually kill him, Vainglory instructs Carter and Fury to fight each other to death to determine who is more fit to be at his side, Tara reveals to Cole that she has no memory of her life before high school, Carter chops Fury's arm off before finally burning him to death.
- 22 Vainglory meets the riders face-to-face for the first time, Marcoh is severally wounded, and Joel returns to META revealing that he and Rylee had a child together.
- 24 Tsukasa Kadoya aka Kamen Rider Decade arrives in Ardent City, Alex's driver is broken and the four elemental riders are killed by Decade
- 25 Alex wakes up to find that the world is entirely different. Cole is a normal high school student, Sarah is still alive, Tara and Carter don't know who he is and Shiore is nowhere to be found.
