Janet Weiss (A Heroine) is a character created by Richard O'Brien who appears in in The Rocky Horror Picture Show. She is played by Susan Sarandon.
The character was first played Julie Covington in the Original London Cast. In The Rocky Horror Picture Show: Let's Do the Time Warp Again, the character is played by Victoria Justice.
Janet Majors is the married name of the character in Shock Treatment, played by Jessica Harper.