The villains have set their sights on seizing something a little bigger - Earth itself - led by Gugu Mbatha-Raw's Salt.
The actress appeared in Doctor Who during the David Tennant era as Tish, sister of the Doctor's companion Martha Jones.
She went on to have roles in high-profile shows including Black Mirror, Loki and The Morning Show.
And you might not immediately recognise her on her return to the Whoniverse, thanks to her transformation into the leader of the Sea Devils.
"The prosthetics are just so detailed," Gugu tells Newsbeat.
Not everyone on set was a fan, though.
"But Russell's dog Rocky wasn't into it," she says.
"I'd forget I was dressed as Salt, he'd growl and I'd think: 'Oh yeah, I'm blue'."
"The War Between is a wild, epic, thrilling adventure," says Gugu.
"It has so many compelling messages about the world we're living in and what we can do about it."