When Obal Ferras plans to have Clarice Willow killed (to stop her from gaining support for her Virtual Heaven program), Diego helps Clarice turn the tables on Obal. Diego and the Conclave kill Obal instead. ("Unvanquished")
Diego picks up Lacy Rand and Odin Sinclair from the Gemenon spaceport to take them to the STO training camp. He is part of a secret test to determine how strong the recruits are in their monotheist faith. ("Blowback")
He asks Lacy how she has the ability to command the U-87 robots when she does not have command authorization. ("The Heavens Will Rise") Because of this he is part of a plot to kill Lacy, but Devanna kills him instead in a counter attack. ("Here Be Dragons")
Robbins also played the Armistice Officer on the Battlestar Galactica miniseries (2003) and Connor on the Battlestar Galactica reimagined series.