Underwood wrote and performed a well-known single called, "Baby, Can You Dig Your Man?". He suffers from low self-esteem and does not believe that he is capable of good. He is one of the survivors of the superflu known as Captain Trips.
Larry tries to redeem himself by visiting his mother in New York, which means leaving his beach house in California, after some time spent in new york more and more people start to catch the superflu (and consequently die because of it), including Larry's mother. After the death of his mother at the hands of the superflu, Larry was called to Mother Abagail in Hemingford Home, Nebraska. He escaped New York City with Rita Blakemoor, a woman with crushing anxiety and prescription drug addiction. Rita eventually overdoses on pills and chokes to death during her sleep. After travelling for a while by himself he feels as though he is a "new man" or at least he feels that he should try to be. After more travelling he begins to be stalked by Nadine Cross(a troubled soul) and Leo Rockway (a young boy who's family died due to the superflu, and was taken into care by Nadine) - Leo's past traumatised him and left him an a temporary violent and Neanderthal-like state, a state which he was still like during the stalking of Larry. After a while Larry starts to suspect that he is being followed, and once he reaches Maine, is attacked by Leo (who is barring a knife), Larry manages to disarm Leo and is urged by the the worrisome Nadine not to harm him - which he was not intending to. Larry teams up with Nadine and Leo. Along Larry's journey he is successful in gaining the trust and love of Leo (whose real name turns out to be Joe), which Larry originally wanted to impress Nadine, but later felt genuine love for the boy. After some more travelling a distressed woman by the name of Lucy Swann spots the threesome and joins them.
Larry becomes a part of the Boulder Free Zone Committee despite his self-doubts. He is one of the few called to go to Las Vegas, Nevada to stand against Randall Flagg. He is killed in the thermonuclear bomb explosion, sacrificing himself so that the good can prevail in the battle.