As we reported, last week Marina Sirtis tweeted that she was going to Toronto for mysterious reasons, and then on Friday, Star Trek: Discovery episode 2 director Jonathan Frakes tweeted a picture of himself with her backstage. Coincidental? Perhaps. However, the next day Sirtis called out Mary Wiseman specifically in a tweet — not “the cast of Discovery” or something more generic.

There’s a good chance that Sirtis just happened to be shooting something else in Toronto (which is a busy city for film and TV projects after all), and came for a set visit while she was there. She had a particularly nice chat with Mary Wiseman, hence the name drop in Sirtis’ follow-up tweet. No more, no less. But let’s put on our speculation caps on to discuss the more interesting possibilities, shall we?

Deanna Troi

This one is highly unlikely, as Deanna won’t even be born for another 80 years or so. But the fandom does like to speculate, so let’s get this one out of the way. Deanna Troi doesn’t make much sense, without some timey-wimey stuff that just doesn’t fit with where season two of Discovery seems to be heading.

Tilly’s mother

Since Mary Wiseman seems to be called out specifically, might Marina have been there as a cameo playing Tilly’s judgmental, curls-hating mother? Tilly could have a holographic phone call with mom, which means Sirtis would have been on set with her. From behind-the-scenes shots we’ve seen, it looks they generally film the “holographic communicator” scenes with the two people on the set like normal, and then in post-production they make one of the people a partially translucent holographic version.

Number One

This is a fun idea we’ve seen floated about. What if Sirtis is following in her TV mom’s footsteps? Majel Barett-Roddenberry played Number One in “The Cage,” and then was Lwaxana Troi, Deanna’s mother, in Next Generation. While this is a nice idea, we don’t think Marina is the right type to play Number One as she’s very vivacious, having left her conservative Troi persona behind long ago. She’s also too old (sorry!), as Number One would be in her mid-to-late-30’s at the time of Discovery.

USS Enterprise computer voice

This is another fun “following in her TV mom’s footsteps” idea. Majel Barett-Roddenberry was the voice of nearly all Starfleet computers in the Trek franchise right up until her death in December 2008, and Sirtis recorded her voice for a TOS computer in the Star Trek Continues episode “Pilgrim of Eternity.” What doesn’t fit about this idea, though, is that Sirtis wouldn’t need to go to Toronto for a voice-only role; she could simply go into a sound booth in L.A. and record her lines.

Captain of the USS Hiawatha

We know that the USS Hiawatha somehow crosses paths with the USS Discovery, thanks to the casting announcement for Tig Notaro as its Chief Engineer. Perhaps Sirtis has a brief cameo as the captain of the USS Haiwatha, akin to what Kelsey Grammer did back on Next Generation in “Cause and Effect.”

A Troi family ancestor

Another possibility is that Sirtis might be playing a Troi ancestor, like Brent Spiner did with the Soong family on Star Trek: Enterprise. Betazed was name dropped by both Harry Mudd and Emperor Georgiou in season one, so it’s a known world to folks in the 23rd century. Perhaps Tilly needs to contact a telepath, possibly as she helps her boss and mentor Paul Stamets recover from all the brain-scrambling effects of the spore drive. She could also be playing one of her human ancestors, representing her father’s side of the family.

A completely new character

Perhaps Sirtis isn’t playing any of the obvious choices and she’s doing a cameo as an entirely new character. The tweets to Mary Wiseman sure make it seem like she’s sharing a scene with Sirtis. Last week Ted Sullivan tweeted about “Tilly’s jacket,” so could this be Tilly in civilian garb instead of uniform? perhaps meeting with an alien or Earth colony leader played by Sirtis?

Actual text to me from @StarTrekRoom writer: "Call me when you can. I have a question about Tilly's jacket." #TVlife #StarTrekDiscovery @may_wise — Ted Sullivan (@karterhol) May 5, 2018

Keep in mind, this is all speculation, and it’s entirely possible that Sirtis went to Toronto to shoot something else, stopped by the Discovery set to visit her pal Jonathan Frakes, and spent a few minutes with Mary Wiseman while she was there. Time will tell.

Star Trek: Discovery is available exclusively in the USA on CBS All Access. It airs in Canada on Space and streams on CraveTV. It is available on Netflix everywhere else.

Keep up with all the Star Trek: Discovery news at TrekMovie.