After Dynasty, Thomson returned to daytime soaps. In 1990, he joined the now defunct series Santa Barbara (as the third actor to portray the character Mason Capwell). His commitment to Santa Barbara left him unable to reprise his role as Adam Carrington in the TV miniseries Dynasty: The Reunion (1991), and he was subsequently replaced by British actor Robin Sachs. Thomson had roles on The Young and the Restless, Passions, Sunset Beach, and in 2009, he appeared on Days of Our Lives.
