He starred as Robert Cannon in Foreign Intrigue; a role which popularized the trench coat-wearing detective in public consciousness.

He appeared in numerous Broadway plays through 1946, including Anton Chekhov's The Marriage Proposal,[1] William Saroyan's Get Away Old Man,[1] Joseph Fields and Jerome Chodorov's My Sister Eileen,[2] Clifford Odets's Golden Boy,[2] and Leonid Andreyev's He Who Gets Slapped.

[2] His breakthrough role was as Robert Cannon in the 1950s TV series Foreign Intrigue in which he popularized the image of the trench coat-wearing detective.

[1][2] When James Daly replaced him on the program, the producers attributed the change to Thor's wanting more money.

Shore also periodically worked as a film actor, appearing in Riot in Juvenile Prison, 55 Days at Peking, Love and Bullets, St. Ives, House of the Black Death, and 10 to Midnight.