"We are happy to re-unite the Avengers cast to present on our show. Audiences who enjoyed the year's biggest box office hit will be excited to see these terrific actors back together again."
Downey Jr. has twice been nominated for an Oscar, for his leading role in Chaplin (1992) and for his supporting role in Tropic Thunder (2008).
Evans, who will be making his first Oscar show appearance, will be seen in the upcoming The Iceman.
Jackson was nominated in 1994 for his supporting role in Pulp Fiction. He can also be seen in this year's Best Picture nominee Django Unchained.
Renner was nominated for his leading role in 2009 Best Picture winner The Hurt Locker