A would-be universal conqueror , the Master wants to control the universe ( in The Deadly Assassin his ambitions were becoming `` the master of all matter '' , and in `` The Sound of Drums '' he acknowledges that he chose his own name ) . A would-be universal conqueror , the Master wants to control the universe ( in The Deadly Assassin his ambitions were described as becoming `` the master of all matter '' , and in `` The Sound of Drums '' he acknowledges that he chose the name `` the Master '' ) , with a secondary objective of eliminating and\/or hurting the Doctor .