Despite being slightly behind it's predecessor in it's second week Ultron has still managed an incredible $312.5 million so far.
Making it's debut in the runner up spot this week is Hot Pursuit, a female cop comedy starring Sofia Vergara and Oscar winner Reese Witherspoon.
Hot Pursuit takes $13.3 million on it's debut, some $63 million behind the top film of the week.
There are no other new film on the American box office this week.