The Oscar-nominated actor was receiving treatment in a Los Angeles hospital for a heart attack he suffered in July.
The new clip features Ryan Reynolds meeting Kilowog, the drill sergeant of the Green Lantern Corps, played by Michael Clarke Duncan.
The entire Green Lantern Corps are wielding their rings in this latest banner for the DC Comics superhero saga.
Hal Jordan, Kilowag, Sinestro, and Tomar-Re pledge themselves to protect the galaxy in Martin Campbell's upcoming superhero adventure.
Martin Campbell directs this superhero adventure which features Ryan Reynolds as the title character and Mark Strong as the villainous Sinestro.
The gentle giant actor will voice this gentle giant CGI creation in Martin Campbell's summer superhero adventure.
Michael Clarke Duncan is being eyed as the voice of Kilowag, but Warner Bros. hasn't confirmed the actor for the role at this time.