The latest trailer for Deadpool & Wolverine gave audiences their first good look at the movie’s big bad, Cassandra Nova. She’s an X-Men character with a weird history in the comics and no obvious connection to Deadpool. So how does she fit into the merc with a mouth’s introduction into the MCU? The trailer doesn’t give us too many hints, but based on the multiversal shenanigans we know the movie will involve, the key to understanding Deadpool & Wolverine may be a mostly forgotten spinoff comic