The crew of the Bebop finds the edge of their crystal sphere* and ends up in Realmspace, got kidnapped by mindflayers, and have to deal with the parasite before repairing their ship and heading home

There’s one cutscene with Spike fighting a dragon in the Swordfish II, and obliterating it with the plasma cannon

*I know crystal spheres aren’t part of the lore anymore but that’s stupid and I don’t respect it