William Shatner lent his distinctive vocal stylings to a cover of Black Sabbath's heavy metal classic in a behind-the-scenes video from the recording of his new album. I...am...Iron Man! 

While best known as 'Star Trek's' Captain Kirk, Shatner has also had something of a second career as a singer, er, interpreter of classic songs like 'Lucy in the Sky with Diamonds' and 'Mr Tambourine Man.' His distinctive talk-singing style has been featured on the cult classic albums 'The Transformed Man' and 'Has Been.'

Shatner's latest symphonic opus, 'Seeking Major Tom,' will be dropping soon.  Listen to the irrepressible 80-year old TV legend rock out on a Sabbath classic below.

[via YouTube]