Ariana Grande, left, and Cynthia Erivo in Universal Pictures’ “Wicked”; Pedro Pascal, left, and Paul Mescal in Paramount Pictures’ “Gladiator II.” Universal Pictures’ “Wicked” needed no lessons in how to be popular at the domestic box office this weekend, opening at No. In second place this weekend was Paramount Pictures’ “Gladiator II,” which launched at $55.5 million in the United …
