He guest starred on "First Monday", "" (reunited with Scott Bakula from "Quantum Leap"), "Stargate SG-1", "JAG", "Crash" with Hopper. He had a semi-regular part on "Battlestar Galactica" from 2008 as John Cavil. He made a minor appearance in a new 2009 adaptation of "The Dunwich Horror", followed by roles in the films "C.O.G." (2013), "Max Rose" (2013), "Deep in the Darkness" (2014), and "Persecuted" (2014). As of 2015, Stockwell has been seen in Taos, New Mexico with his personal assistant, and is considered a resident. He reunited with Bakula in a 2014 episode of "", titled "Chasing Ghosts," and the following year appeared in the film "Entertainment" (2015). It was reported in January 2017, by his wife Joy, that he had suffered and recovered from a stroke in 2015 and was now retired from acting. Stockwell is an "avowed environmentalist". He campaigned for the Democratic Party in the 1992 U.S. presidential election.