(Huber on ER, Smith on Seinfeld) Huber (Kay E. Kuter) has a pretty impressive filmography… he did made an appearance at ER once, but participated in over 30 movies, and add countless appearances in various episodes of many shows (ER, Seinfeld, Fraiser, X-Files, Star Trek TNG, much more..)
Smith (Bruce Ed Morrow) didn’t do too well… he was on Rosewell (1994) but as an alien clown…
