He appeared in a few other movies and TV shows before being cast as Special Agent Mike Andrews in I Led Three Lives.

After his stint as Clark on Rocky Jones, Hudson starred in several science fiction, fantasy, and monster movies, in such films as The She Creature, The Amazing Colossal Man.

In 1964 he was cast as the doomed first Captain of the Seaview, John Phillips, in the pilot episode of Voyage to the Bottom of the Sea.

In 1965 he was back on Voyage as a different character in an episode infamous among fans of the series due to its heavy use of archive footage from the pilot episode (specifically a scene with Hudson and Richard Basehart leaving the Nelson Institute, being chased and attacked by a helicopter and which ended with the death of Hudson's character and the car going off a cliff aflame)[2] giving him the dubious honour of being the only person "killed" on that show twice.

He died at age 55 on April 5, 1974, in Woodland Hills, Los Angeles, California from cirrhosis.