The chief investigator for the Vulcan High Command who examined the 2154 bombing of the United Earth embassy and was exposed as the man who had planted the device.
Stel appears in the fourth-season Enterprise episode The Forge. After an explosion at the embassy on Vulcan kills dozens, including Admiral Forrest, he takes charge of the inquiry on behalf of Administrator V'Las.
He soon produces DNA evidence from the wreckage pointing to T'Pau, a member of the dissident Syrrannites, and the High Command uses it to justify a crackdown. Phlox finds that the genetic trace has been tampered with.
A security guard injured in the blast holds the truth. Ambassador Soval performs a mind meld on the comatose man and sees Stel himself placing the bomb, revealing that the attack was arranged from within the government.