Before he descended into the pile of filth that is American television to play Jimmy on FX’s You’re the Worst, Chris Geere was an illustrious actor in the British theater (pronounced “thee-A-tor”). Yes, in his time, he strutted and fretted upon the stage, working in the Royal Shakespeare Company with colleagues like Dame Judi Dench herself. And what roles did Mr. Geere assume at that time? Why, that of the second spear-holder from the left, a crucial part — essential, really.