In addition to discussing the state of this world, Andrea and I also watch superhero TV series that involve inter-universal crossovers within a fictional multiverse.
Worthwhile prose sf that I have read about multiverses includes:
Conquistador by SM Stirling;
Poul Anderson's A Midsummer Tempest in which -
the Prince Rupert of the Rhine from the Shakespearean universe of this novel (A Midsummer Tempest),
Holger Danske from Carolingian myth and from Anderson's Three Hearts And Three Lions,
and Valeria Matuchek from the magical universe of Anderson's Operation Otherworld -
- meet each other in the inter-universal inn, the Old Phoenix, from Anderson's "House Rule" and "Losers' Night," the first cameoing Nicholas van Rijn from Anderson's Technic History and the latter featuring among others Winston Churchill.
We can't get enough of it. (But fortunately Anderson gives us quite a lot.)
Addendum, 29 April: Life has gotten busy here. (I use an Americanism out of respect for Poul Anderson.) So far this year, we have had 440 posts in 4 months so maybe that is enough until some time early next month? On Saturday, there will be a May Day March and Rally in Lancaster and, on Sunday, I might get a lift to a Wesak (The Buddha's Birthday) Festival in Northumberland. Did both last year. (Maybe not many people celebrate both.) Anderson-wise, we are still rereading Harvest The Fire. After that, who knows? Onward through the multiverse.