Along with 'Majel Barrett' (qv), 'Clint Howard' (qv) and 'Jack Donner' (qv), he is one of only four actors to appear in both _"Star Trek" (1966)_ (qv) and _"Enterprise" (2001)_ (qv).
He has had roles in four different "Star Trek" series: _"Star Trek" (1966)_ (qv), _"Star Trek: Deep Space Nine" (1993)_ (qv), _"Star Trek: Voyager" (1995)_ (qv) and _"Enterprise" (2001)_ (qv). Besides 'Majel Barrett' (qv), who has appeared in every "Star Trek" series, he is the only actor to appear in all four. Moreover, since Barrett only provided voice overs in the latter two series, he is the only actor to appear on screen in all four.
Is one of only 32 actors or actresses to have starred in both the original _"Star Trek" (1966)_ (qv) (up to and including _Star Trek VI: The Undiscovered Country (1991)_ (qv)) and then in one of the spin offs.

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