"By Grabthar's Hammer, by the Sons Of Warvan, you shall be avenged!"
The Sons of Warvan were extremely important religious or political figures in Dr. Lazarus's culture. They was used as part of the oath,"By Grabthar's Hammer, by the Sons of Warvan, you shall be avenged."
They were was first used in the film Galaxy Quest.
As with the Grabthar's Hammer, the Sons of Warvan are noteworthy for being fictional within an already-fictional universe. As such, they has no direct analog in American English.