Sole Appearance: Episode 31 - "Home Aflame"

A soldier, Mark was called in by Earth authorities in the hope of talking his son Bes into handing over the Solo Ship and the Ideon. Officers told him and his wife Elmi that Bes was committing treason.

They tried to reason with their son, but he remained convinced that giving the Sixth Civilisation technology to Earth would be a bad move. His parents left disappointed in him. They presumably died when the planet was destroyed by the Ide.

Thanks to Quiddity for letting me know the name of Bes' mother.