Mikaela Hoover and Christopher McDonald have joined the cast of ‘Superman’. Director James Gunn currently has the movie – which will star David Corenswet as Clark Kent/Superman, and Rachel Brosnahan as Lois Lane – in production in Atlanta, and he has been taking steps to fill out the supporting cast for the project. According to the Hollywood Reporter, Mikaela – who previously worked with the director on films including ‘Guardians of the Galaxy’, ‘The Suicide Squad’ and ‘The Belko Experiment’ – will play Cat Grant, who was depicted in the comic books as a gossip columnist who has her eyes set …