When we last saw Grant, Lucy, and Jennifer in ‘The Return of Doctor Mysterio’, they were settling down together as a family – and Grant’s superhero costume was safely stored away.

But that wasn’t the end of the story! Now, the Doctor is swooping back into their lives – because the alien gem that gifted Grant his powers has counterparts all over the universe. It’s up to the Doctor, Grant, Lucy and Jennifer to track them all down – to prevent cosmic disaster!