Character: Leonard Hofstadter
Experimental physicist Leonard Hofstadter withstood living with Sheldon and his iron-clad “roommate agreement” for much of “The Big Bang Theory” before Sheldon moved in with his girlfriend, Amy. Leonard finally managed to put a ring on on-again/off-again love interest Penny’s finger in the show’s seventh season.
Played By: Johnny Galecki
First known for his role as David on “Roseanne,” Johnny Galecki now plays the conventional scientist to Jim Parson’s Sheldon and his array of quirks. Galecki also performs in a duet band when he’s not filming The Big Bang Theory.
