Just got BEYOND #4 today and in the battle with the Space Phantom (he turned into Xemnu first) he was defeated, so to escape, he turned into Northstar.
The group (Deathlok, Wasp, Henry Pym, Gravity, Medusa, Firebird, Kraven and the Hood) enter into Limbo where they find Northstar.
Northstar doesn't have any speaking role in this ish.
MM