Dr. Alien is a 1989 American science fiction comedy film starring Judy Landers, Billy Jacoby, and Olivia Barash. Directed by David DeCoteau, the film was also released under the titles I Was a Teenage Sex Maniac and I Was a Teenage Sex Mutant. The alternative titles explain the movie's plot.

The film's plot centers on an unpopular honors student named Wesley Littlejohn (Billy Jacoby), who becomes involved in an experiment headed by his new, sexy biology teacher, Ms. Xenobia (Judy Landers). As part of the experiment, Wesley becomes a chick magnet whenever a phallic stalk emerges from his head. However, this threatens to alienate the girl he really cares about, Leanne (Oliva Barash), and Wesley begins to suspect Xenobia's motives, which may have something to do with the fact that she isn't from Earth.