The Extra Special Guest Star

 Something occurred to me while watching the first and second seasons of Columbo. In multi-part film and television stories--basically all film and television stories save anthology series and stand-alone films without sequels--producers will often cast a stable of actors multiple times as different characters within those stories. 

In the James Bond films, for example, multiple actors have played characters such as M, Q, Moneypenny,  Bill Tanner, Felix Leiter, Blofeld--and even Bond himself. 

Roger Moore's Bond worked for two Ms, but neither he nor Moneypenny remarked upon their boss' change in appearance. Nor did Bernard Lee's M remark on Bond's change in appearance from On Her Majesty's Secret Service to Diamonds Are Forever to Live and Let Die. 

This is, of course, because characters are played by different actors in different productions all the time. We, the audience, don't remark on it, so why would the characters? 

Consider the inverted case: a guest actor appears several times during a television series, playing different roles. On Star Trek, for example, Diana Muldaur played Doctor Ann Mulhall in "Return to Tomorrow" and Doctor Miranda Jones in "Is There in Truth No Beauty?" Years later, she played Doctor Katherine Pulaski throughout the second season of Star Trek: The Next Generation. No character on either show confused Muldaur for any of the other characters she played within the same continuity. 

Of course. Same actress, different characters; in the shared universe of Star Trek, they're simply three distinct people who happen to look alike (to the eyes of the audience, at least). 

Forgive this rambling preamble; I'm aware that anyone who watches television or movies is well aware of the phenomena I've just described. 

But wouldn't it be fun if a creative team took advantage of our familiarity with the common practice of actors reappearing as different characters?  

Imagine, for example, Doctor Pulaski at the end of season two of Star Trek: The Next Generation. What if the good doctor had actually been Doctor Ann Mulhall the entire time, having faked her own death at some point between the 23rd and 24th centuries and given herself a new identity as Pulaski? Furthermore, what if, during the events of "Return to Tomorrow," Thalassa actually retained control of Mulhall's body and simply pretended to be her from that point forward? 

Imagine a two-part second season finale for TNG. In part one, Troi, working on a project with Pulaski more closely than usual, senses something off about the doctor. Furthermore, the doctor seems troubled by her conscience, and remarks on how old she feels--even though by 24th century standards she's in robust, middle-aged health. At the end of part one, during the course of a solo scientific mission in a shuttlecraft, she changes course and appears to be preparing to fly straight into a star. 

Part two opens as the TNG crew prevents Pulaski's suicide. Troi tries to counsel her, and naturally Riker, Picard, Data, and the others are concerned and reach out in different ways, trying to figure out what's gone wrong in Pulaski's life. 

The audience should be wondering too, because to us, she's Pulaski. By season's end, most viewers will have long forgotten that they remember Diana Muldaur from the original series. In fact, I'd wager 99% of viewers would be just as confused by Pulaski's actions and demeanor as the show's heroes. 

Finally, Pulaski lets slip a cryptic phrase, quoting some of her own words from "Return to Tomorrow:" "I told him oblivion together didn't frighten me. I lied." 

Then, a beat later, just before she successfully kills herself: "I'm not frightened anymore. Forgive me, Ann." 

For fans just familiar enough with Star Trek lore, the puzzle pieces should snap into place with what I hope would be dramatic impact. 

Our main characters are traumatized by all this--suicide being incredibly uncommon in the utopian world of the 24th century. In the episode's denoument, Troi and Data uncover Pulaski's past, reporting their findings to Captain Picard, who has to decide what to make of all this. The story of Mulhall/Thalassa/Pulaski is a triple-pronged tragedy of Shakespearean proportions, and a dark finale for the show's sophomore season. 

At the very least, I think this would have been better than "Shades of Grey." Plus, it would have given Doctor Beverly Crusher a powerful in-story reason to return--to be there for Picard and her other friends in the wake of such traumatic events.