Marvel screened 20 minutes of footage from the upcoming Avengers: Endgame
In front of an audience of more than 100 members of the Academy of Motion Picture Arts and Sciences, Winfrey supported Disney's best picture contender Black Panther.
The motion comes in response to a recent memorandum filed by the plaintiffs, claiming the actor "gladly accepted responsibility for his personal participation when the publicity was favourable".
The 74-year-old missed the event due to heart surgery, amid a furore after he was found to have received payment for staged paparazzi photographs.
Marking the fourth time the Philippines has won the crown.
