Dark Matter Wiki

Ryo Tetsuda

306pages on
this wiki
Add New Page
Comments0 Share
Ryo Tetsuda
Ryo Featured Season3
Portrayed by
Alex Mallari Jr
Justin Deleon (Young Ryo)
Emperor Ishida Tetsuya (Father)
Empress Ishida Li Na Katsumi (Stepmother)
Hiro Ishida (Half-brother)
Emperor of the Principality of Zairon
Ambassador of Autonomous Worlds
Blade weapons specialist
Crew Member (Raza)
Season 1
Season 2
First Appearance
Episode One
Last Appearance
Episode Twenty-Six

Ryo Tetsuda, also known as Four or Ishida Ryo, is a main character that appears in Season 1 and 2 of Dark Matter. He is portrayed by Alex Mallari Jr.


Ryo, also known as Four or Ishida Ryo, is a loyal member of the crew. He is a stoic person and speaks very few words, but when he is up against an opponent he is fierce and relentless. He is a skilled master in regards to the blade. [1]

Episode One revealed Ryo is on the Galactic Authorities Most Wanted List for murder, assault and piracy.

Episode Four revealed Ryo's father, Emperor Ishida Tetsuya, was murdered and that Ryo is a suspect.

Episode Six revealed that Ryo had been framed for his father's murder by his stepmother.

In Episode Seven, when the android Wendy ran amok on the ship, intending to kill the crew, Ryo intervened and stopped Wendy once and for all by decapitating her with his sword which caused her body to shut down for a while until it came back online once her head was partially activated.

In Episode Eight, Ryo contacted his brother Hiro to arrange a meeting to tell him the truth of their father's death.

Emperor ryo gallery04

Ryo deals with his former mentor.

In Episode Nine, Ryo left the Raza to meet with his brother but instead was faced with Akita, his old teacher who had raised him when he was young. Akita was going to take him prisoner to the Principality of Zairon but the Raza crew arrived to rescue him. Ryo then killed Akita as a sign to his brother. After this meeting, he becomes quite obsessed with taking his rightful throne on Zairon. Back on board the Raza, after the crew saved him, he also declared to Two that when he does take back the throne, he will remember his real family.

In Episode Twenty-Four, Ryo decides to regain his past memories. He asks The Android to help him upload his neural imprint.

Emperor ryo gallery03

Ryo arrested in Zairon.

In Episode Twenty-Five, the war between Zairon and the Pyr was going bad for Ryo's people. Because of this, Ryo was able to convince Hiro that use of blink drive in their fleet would turn the tide of war. He also was able to make Hiro question his mother and realize it was Empress Katsumi who had murdered their father.

Ryo went to claim his throne from his brother, however it didn't go to plan. It was revealed that Katsumi had made a deal with the Seers in order to predict Ryo's actions, which lead to Ryo being arrested and his allies in the Zairon ranks killed.

Episode Twenty-Five gallery 1

"My name is not Four, I am Ishida Ryo, Emperor of Zairon!"

During, Ryo's trial that convicted Ryo to death, Hiro was freed from his room by Five and he put a stop to the trial and informed them of Empress Katsumi's treason. Hiro then stepped down and Ryo became Emperor. His first decree as Emperor was 'Korose'. The enactment of the quick deaths of all those who had been involved with the past Royal Court, including Empress Katsumi, Hiro, Hansmeed, and The Seers. He then renounced the name of 'Four' and claimed himself as Emperor Ishida Ryo.

Emperor ryo gallery01

Ryo as the Ambassador for autonomous worlds.

In Episode Twenty-Six, Ryo's next act as Emperor was to cause conflict with the corporations that where financially backing Pyr. He had the Council of Corporations targeted. He arrived as a new delegation, appearing as an ambassador for the autonomous worlds. Then later had their station, EOS-7 overloaded, causing many explosions, while he took off with the Raza's blink drive, with the intent to reverse engineer it and supply his fleet.

Physical Appearance

Ryo is tall with cropped, dark hair. He has dark eyes and an athletic build. He can commonly be seen wearing tight-fitting black shirts, cargo pants with multiple holsters, and combat boots.


Dark Matter: Season One
Episode One
Episode Two
Episode Three
Episode Four
Episode Five
Episode Six
Episode Seven
Episode Eight
Episode Nine
Episode Ten
Episode Eleven
Episode Twelve
Episode Thirteen

Dark Matter: Season Two
Episode Fourteen
Episode Fifteen
Episode Sixteen
Episode Seventeen
Episode Eighteen
Episode Nineteen
Episode Twenty
Episode Twenty-One
Episode Twenty-Two
Episode Twenty-Three
Episode Twenty-Four
Episode Twenty-Five
Episode Twenty-Six



  • Ryo Season 1 Promotional Image
  • Ryo Season 1 Promotional Image
  • Ryo Season 1 Promotional Image
  • Episode One Still
  • Episode Two Still
  • Episode Twenty-Six Still
  • Ryo and his former mentor Akita.




  1. SyFy - Meet The Crew
  2. Joseph Mallozzi's Weblog - December 18, 2014: Introducing the Dark Matter cast! (Retrieved July 3, 2015)

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.