It's been a while since I've watched the show. I'm sitting here wondering, how many TNG and VOY crossovers did the show do? I'm specifically asking about TNG and VOY crossovers that were done as DS9 episodes. O'Brien and Worf don't count, because that is too easy.
The Obvious: O'Brine joins the cast in the series premiere, Worf in the S4 premiere. The Enterprise-D, Picard, Thomas Riker (transporter clone), Gowron, Troi's mom, the Duras sisters all pop up on DS9. I feel like DS9's opening season had a crap ton of TNG people going, "Hey guys, it's MEE!!!"
Season 2 calmed down a bit, now that people knew the show existed.
I'm trying to think of actual crossovers, and not just shared background ships, sets, props, costumes that got shared across TNG-DS9-VOY.
From VOY: mirror-Tuvok in the 2nd MU episode, "Doctor Bashir, I Presume?" with Dr. Zimmerman and "an" EMH, and the Intrepid-class Bellerophon (spelling?) in S7. Given the shows were on opposite sides of the galaxy, I think these were the only VOY crossovers.
I am sure there are more. Wha'cha got?

The Obvious: O'Brine joins the cast in the series premiere, Worf in the S4 premiere. The Enterprise-D, Picard, Thomas Riker (transporter clone), Gowron, Troi's mom, the Duras sisters all pop up on DS9. I feel like DS9's opening season had a crap ton of TNG people going, "Hey guys, it's MEE!!!"


From VOY: mirror-Tuvok in the 2nd MU episode, "Doctor Bashir, I Presume?" with Dr. Zimmerman and "an" EMH, and the Intrepid-class Bellerophon (spelling?) in S7. Given the shows were on opposite sides of the galaxy, I think these were the only VOY crossovers.
I am sure there are more. Wha'cha got?