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We are Sigma. Created by Tenjuro Banno, we are the deity that will oversee mankind.
~ Sigma introduces itself to Drive and Heart

The Sigma Circular, also known more simply as Sigma, is a sentient machine created by Gold Drive and Roidmude 004 to dominate all of humanity by converting them into data, serving as the final antagonist of Kamen Rider Drive.

History

Sigma Circular was created by Banno to fulfill his desire to become a god by triggering a second Global Freeze and converting everyone on Earth into data, so Banno could only give bodies to those who bowed down to him.

During the first attempt to activate this machine, Medic was originally meant to be a sacrificial vessel, but Brain took her place to save her from being killed.

After escaping, Gold Drive and the Reaper Legion infiltrated the Special Defense Center headquarters, and placed Sigma under evolution process before Drive, Mach, Chaser, Heart and Medic could stop his plan to create a second Global Freeze.

Sigma's evolution was completed, activating the second Global Freeze just before Drive and Heart arrived to stop the machine. Sigma was destroyed by the combined force of Drive Type Tridoron's Rider Kick and Heart Super Evolved's strength punch. With its destruction, the Global Freeze ended and all the humans who were transformed into data were returned to normal.

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Roidmudes
Executives: Freeze Roidmude | Heart Roidmude | Brain Roidmude | Medic Roidmude | Mashin Chaser | Roidmude 004 | Roidmude 006 | Kamen Rider Gold Drive | Roidmude 089 | Revenger Roidmude | Angel Roidmude | Paradox Roidmude | Sigma Circular
Advanced: Sword Roidmude | Tornado Roidmude | Paint Roidmude | Gunman Roidmude | Crush Roidmude | Volt Roidmude | Iron Roidmude | Voice Roidmude | Scooper Roidmude | Seeker Roidmude | Judge Roidmude | Open Roidmude | Cook Roidmude | Shoot Roidmude | Thief Roidmude | Cyberoid ZZZ
Reaper Legion: Roidmude 013 | Roidmude 015 | Roidmude 019 | Roidmude 021 | Roidmude 022 | Roidmude 028 | Roidmude 032 | Roidmude 034 | Roidmude 035 | Roidmude 041 | Roidmude 044 | Roidmude 045 | Roidmude 054 | Roidmude 059 | Roidmude 070 | Roidmude 075 | Roidmude 080 | Roidmude 081 | Roidmude 083 | Roidmude 092 | Roidmude 094 | Roidmude 100 | Roidmude 101 | Roidmude 104 | Roidmude 105
Cobra-Type Roidmudes: Roidmude 014 | Roidmude 031 | Roidmude 037 | Roidmude 038 | Roidmude 049 | Roidmude 052 | Roidmude 055 | Roidmude 057 | Roidmude 062 | Roidmude 063 | Roidmude 073 | Roidmude 074 | Roidmude 082 | Roidmude 085 | Roidmude 086
Spider-Type Roidmudes: Roidmude 012 | Roidmude 018 | Roidmude 020 | Roidmude 025 | Roidmude 036 | Roidmude 039 | Roidmude 042 | Roidmude 046 | Roidmude 047 | Roidmude 056 | Roidmude 060 | Roidmude 064 | Roidmude 078 | Roidmude 079 | Roidmude 084 | Roidmude 093 | Roidmude 097 | Roidmude 102
Bat-Type Roidmudes: Roidmude 011 | Roidmude 016 | Roidmude 026 | Roidmude 040 | Roidmude 048 | Roidmude 051 | Roidmude 053 | Roidmude 061 | Roidmude 066 | Roidmude 068 | Roidmude 069 | Roidmude 071 | Roidmude 076 | Roidmude 077 | Roidmude 087 | Roidmude 088 | Roidmude 095 | Roidmude 096 | Roidmude 098 | Roidmude 103 | Roidmude 107

Humans
Hajime Taga | Itsuro Negishi | Koichi Sakaki | Koya Nishihori | Kisaburo Sasamoto | Makoto Asamura | Matsutaro Okumura | Mitsuhide Nira | Reiko Nishihori | Shunsuke Kusaka | Takuro Mogi | Tenjuro Banno | Zoruku Tojo

Neo-Shade
Keisuke Okamura | Roidmude 012 | Roidmude 055

Shocker
Great Leader of Shocker | Kyoichiro Kuroi | Kamen Rider 4 | Roidmude 089 | Hiruchameleon | Turtle Bazooka | Roidmude 016 | Roidmude 057 | Roidmude 076 | Arimammoth | Cheetahkatatsumuri | Kamen Rider Ouja | Kamen Rider Sasword | Kamen Rider Dark Kiva | Kamen Rider Baron

Kibaoni Army Corps
Kyuemon Izayoi | Hitokarage

Mu
Leader of Mu | Oogumo Great Leader | Cancer Zodiarts | Gremlin | Demushu | Gamma Superior | Guren Graphite | Kamen Rider Dark Kiva | Kamen Rider Wiseman | Kamen Rider Poseidon | Kamen Rider Duke | Kamen Rider Dark Ghost | Kamen Rider Another Para-DX

Movie-Exclusive
Megahex | Ryoma Sengoku | Zoruku Tojo | Da Vinci Gamma | Michelangelo Gamma | Raffaello Gamma | Gamma A

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