Your standard tale of a young man who discovers the daddy he never met was an alien, SPECIMEN is an adequate sci-fi thriller with a serviceable plot that borrows heavily from THE TERMINATOR (1984).
Following a clue to the identity of the father that his mother (who died when he was eight) always refused to talk about, minor league ballplayer Mike Hillary (Mark Paul Gosselaar) visits an old friend of his mother, small-town Sheriff Masterson (David Herman). Although he can't tell him anything,
Masterson recommends Mike for a coaching job at the town's community center. Mike's ability to connect with troubled kids wins him the attention of fellow instructor Jessica...