Danny DeVito Frank Reynolds Actor Charlie Day Charlie Kelly Actor, Executive Producer Glenn Howerton Dennis Reynolds Actor, Executive Producer Kaitlin Olson Deandra "Sweet Dee" Reynolds Actor Rob McElhenney Mac Actor, Executive Producer Mary Elizabeth Ellis Waitress Guest Star Alexandra Daddario Ruby Taft Guest Star Josh Casaubon Trevor Taft Guest Star David Hornsby Executive Producer Tom Lofaro Executive Producer Michael Rotenberg Executive Producer Megan Ganz Executive Producer Nick Frenkel Executive Producer Rob Rosell Executive Producer Scott Marder Executive Producer Victor Hsu Executive Producer