Series: Star Trek: The Original Series
Season 1, Episode 28
Original Air Date: April 6, 1967
The Enterprise crew discovers the "Guardian of Forever," a time/space travel portal. Driven mad by an inadvertent drug overdose, Dr. McCoy leaps through the portal and apparently alters history. Their own existence at risk, Kirk and Spock have no choice but to follow him in hopes of undoing whatever temporal damage has been done.
|via Memory Alpha
My verdict: this is definitely a good episode. Edith is a great character and the moral dilemma presented is exactly the sort of thing I love about Trek. However, I still have my issues with the time travel. If the time stream had changed when McCoy went back, not only would the Enterprise have disappeared but so would the landing party standing in front of the portal, Kirk and Spock included. In fact, McCoy himself wouldn't even have been there to jump through in the first place, so history wouldn't have changed, and so forth. Sure, it's fun and well-written but take a step back and it's messy.
Joan Collins has been married five times, including Percy Gibson from 2002 to the present. She has three children and three grandchildren. A devoted royalist, she was appointed an Officer of the Order of the British Empire in 1997.