"I am going to be appearing on episode 106 of 'Legends' with the goatee, one arm, and we are going to meet Connor Hawke. The lesson as always -- never say never," Amell stated in the following video on Facebook.
The one arm version of Green Arrow is from Frank Miller's The Dark Knight Returns graphic novel. Connor Hawke is the son of Oliver Queen in the comics.
DC's Legends of Tomorrow airs Thursdays at 8pm ET on the CW.