Sean Morgan
Sean Morgan  played Brenner, O'Neil, and  in four episodes of .

Morgan filmed his scenes for  on Monday  at Desilu Stage 9. He filmed his scenes for  on Wednesday  and Thursday  at the 40 Acres backlot. He filmed his scene for  on Wednesday  at Paramount Pictures' "European town" backlot, and his scenes for  on Thursday  at Stage 9. He filmed his scenes for  on Monday , also at Stage 9.

He began his career playing one of Rick Nelson's fraternity brothers, Sean, on The Adventures of Ozzie and Harriet. He made one guest appearance as Sean in 1964 (with Bill Mumy), becoming a regular cast member in 1965 until the end of the series in 1966. Sean was a college buddy of casting director Joseph D'Agosta, who got him his roles on Star Trek. 

His other television credits include Voyage to the Bottom of the Sea (1966, with  guest Peter Mark Richman and Arch Whiting), CHiPs (1977, with  guest Robert Pine), The Lucy Show (1968, with TOS recurring guest Barbara Babcock and VOY/ENT guest Robert Pine), Wiseguy (1987, with DS9 guest Jonathan Banks), and Unsub (with / actress Jennifer Hetrick).

He appeared on Mannix three times: in 1968 (with VOY guest Joseph Campanella and  guest David Brian), and twice in 1970, with Robert Ito and  actor Bill Quinn. He also appeared in the 1980 TV movie Reunion with  actress Joanna Cassidy.

His film credits include Vision Quest (1985, with TNG guests Jana Marie Hupp and Ronny Cox and VOY guest Raphael Sbarge), What's Up, Doc? (1972, with Stefan Gierasch, Graham Jarvis, and Kenneth Mars), and Harry and the Hendersons (1987, with William Frankfather, David Richards, John Bloom, and Kevin Peter Hall).

Morgan eventually left acting to pursue a career in financial services and insurance. Today, he lives in Kalispell, Montana.

Appearances 

Morgan was also erroneously credited in the first edition of the Star Trek Concordance as being in . The part was actually played by John Lindesmith. Morgan was erroneously credited for additional roles in  and  that were edited out of the scripts by the final draft version for actual filming.

External link 
 

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Performers
TOS performers