Zecters (ゼクター ,Zekutā?), also known as the Masked Rider System, are compilation of mobile systems that seem to affect space/time. They were created by the Natives, a species of Worm that arrived on Earth 35 years ago. These Natives in turn gave the Zecters to humans, so that they may protect them from alien Worms that would arrive later. Jaunting from the ZECT headquarters, it appears instantaneously to the selected personnel so that they may transform into the respective Rider to fight any Worms in the vicinity.
There are eight known Zecters within the Masked Rider System, each allowing the user to become a different Rider.

• Kamen Rider Kabuto
  
• Kamen Rider TheBee
  
• Kamen Rider Drake
  
• Kamen Rider Sasword
  
• Kamen Rider Gatack
  
• Kamen Rider Kick Hopper
  
• Kamen Rider Punch Hopper
  
• Kamen Rider Dark Kabuto
  

There also exist two other Zecters known as the Perfect Zecter and the Hyper Zecter. The Perfect Zecter serves as a primary weapon while the Hyper Zecter is a power-up device that enhances the powers of the original Zecter

The main villains of the series, these alien lifeforms seem to take pride in stealing human identities and then killing them. They arrived when the Shibuya Meteorite crashed into Earth seven years ago. Another species of Worm, the Natives, arrived on a meteorite 35 years ago, similar to the Shibuya Meteorite.

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1. The Strongest Man (Saikyou Otoko)
2. The First Two-Step Transformation (Hatsu Ni-dan Henshin)
3. I am Justice!! (Ore ga Seigi!!)
4. Love Explaination!! (Ai o Toku!!)
5. Order to Capture!! (Hokaku Shirei!!)
6. My Flower (Ore-sama no Hana)
7. #2 Appears (Nig Shin Tj)
8. Angry Tofu (Ikareru Tfu)
9. The Bee's Insanity!! (Hachi no Ranshin!!)
10. I'm Not Your Friend (Tomo ja Nee)
11. The Party Burns (Goukon Moeyu)
12. The Makeup Thousand-Man Cut (Keshou Sennin Giri)
13. The Team Dissolves (Chiimu Kaisan)
14. Back of the Back of the Back (Ura no Ura no Ura)
15. The Monster Noted Doctor! (Kaijin Meii!)
16. An Unthinkable Storm (Masaka no Arashi)
17. Restored Memories!! (Yomigaeru Kioku!!)
18. Farewell, Gon… (Saraba Gon…)
19. Scorpion Millionaire (Sasori Fugou)
20. Hey, Jiiya (Nee Jiiya)
21. VS Stag Beetle (Tai Kuwagata)
22. Birth of a Special Compilation (Tanjou Tokubetsu Hen)
23. Riddle + Riddle = X (Nazo Tasu Nazo Wa Ekkusu)
24. The Ramen Way (Raamen Dou)
25. The Proud Searchlight (Ogoru Sousasen)
26. Love That Shook the Earth (Gekishin Suru Ai)
27. Me! A Murderer (Ore! Satsujinhan)
28. Why! Death (Naze! Zetsumei)
29. The Dark Kitchen (Yami Kitchin)
30. Miso Soup Ascension (Misoshiru Shouten)
31. Shocking Fact (Shougeki no Jijitsu)
32. Puzzle Unraveled!! (Tokeru Nazo!!)
33. The Sprouting Adjutant (Moeru Fukukan)
34. Breaking Super Evolution (Kudake Chou Shinka)
35. The Hellish Brothers (Jigoku no Kyoudai)
36. Red Shoes' Recklessness (Akai Kutsu Bousou)
37. School's Ghost Story (Gakkou no Kaidan)
38. The Dangerous Younger Sister (Abunai Imouto)
39. The Powerful Black Opponent (Kyouteki Kuro Kabu)
40. The Saddest Battle (Saidai no Aisen)
41. The Strongest Defeated (Yabureru Saikyou)
42. Worst Terror VS Worst Fear (Saikyou Tai Saikyou)
43. I Targeting Me (Ore o Nerau Ore)
44. What Is to Live (Ikiru to Wa)
45. Christmas Earthquake (Kurisumasu Gekishin)
46. Farewell, Tsurugi!! (Saraba Tsurugi!!)
47. Rushing into the Last Chapter (Saishuushou Totsunyuu)
48. Tendou Dies!! (Tendou Shisu!!)
49. Path of Heaven (Ten no Michi)