7:53ABC NewsMarvelApril 11, 2019Cast of 'Avengers: Endgame' open up about past decade in Marvel universeAfter 10 years and 22 films, the original six Avengers sit down with "Nightline" and say audiences should be prepared to say goodbye to some or all of their favorite heroes.Up Next in news'GMA' Hot List: Iain Glen shares hilarious encounter with a fan at the airport April 10, 2019'Avengers: Endgame' smashing records before movie opensApril 10, 2019'Avengers: Endgame' stars reflect on journey and hint at spoilersApril 8, 2019