The Changeling is a Jacobean tragedy written by Thomas Middleton and William Rowley. Widely regarded as "among the best" tragedies of the English Renaissance, the play has accumulated a significant body of critical commentary.Logan and Smith, pp. 54-5, 59-60, 263-9.
"The Changeling" is a season two episode of Star Trek: The Original Series, first broadcast on September 29, 1967 and repeated May 17, 1968. It is episode #32, production #37 and was written by John Meredyth Lucas, and directed by Marc Daniels.
The Changeling is a 1980 Canadian film directed by Peter Medak and starring George C. Scott and Trish Van Devere.