Simon Helberg will be reprising his role as Howard Wolowitz in the sound booth on Young Sheldon, reuniting with Jim Parsons who narrates the show as Adult Sheldon.
Helberg will lend his voice to the November 18 episode of Young Sheldon, An Introduction to Engineering and a Glob of Hair Gel, which will reveal the origin of Sheldon's long-held feelings of contempt for the field of engineering.
Previously, The Big Bang Theory's Mayim Bialik reprised her role as Amy Farrah Fowler in a fourth season narration, and Kaley Cuoco had an uncredited cameo as the voice of a swimming pool that was haunting Sheldon's dreams.
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