Idris Elba, Cast as Knuckles, in Upcoming 'Sonic' Sequel.br Idris Elba, Cast as Knuckles, in Upcoming 'Sonic' Sequel.br IGN reports that Idris Elba has confirmed that he will br voice Knuckles the Echidna in 'Sonic the Hedgehog 2.'.br IGN reports that Idris Elba has confirmed that he will br voice Knuckles the Echidna in 'Sonic the Hedgehog 2.'.br In an Instagram post, Elba shared a picture br of Knuckles' iconic fist, seemingly confirming br that he has signed on to the cast.br In an Instagram post, Elba shared a picture br of Knuckles' iconic fist, seemingly confirming br that he has signed on to the cast.br In an Instagram post, Elba shared a picture br of Knuckles' iconic fist, seemingly confirming br that he has signed on to the cast.br Elba captioned the post, br "Knock, knock..." and br included the hashtags br #SonicMovie2 and br #Knuckles.br He also tweeted br the same image.br More of Sonic's friends, like Tails, are br expected to play a prominent role in the sequel.br More of Sonic's friends, like Tails, are br expected to play a prominent role in the sequel.br Earlier this year, a leak suggested br that Knuckles would join the cast as well.br Earlier this year, a leak suggested br that Knuckles would join the cast as well.br In the 'Sonic the Hedgehog' games, Knuckles br is an ally and sometimes an enemy of Sonic.br In the 'Sonic the Hedgehog' games, Knuckles br is an ally and sometimes an enemy of Sonic.br According to IGN, as a member of the Echidna clan, Knuckles is tasked with protecting the Master Emerald.br According to IGN, as a member of the Echidna clan, Knuckles is tasked with protecting the Master Emerald.br Fans will have to wait until April of 2022 to see which side Knuckles is on when the 'Sonic' sequel is released.br Fans will have to wait until April of 2022 to see which side Knuckles is on when the 'Sonic' sequel is released.br Elba's most recent performance is in DC and James Gunn's 'The Suicide Squad' which is currently in theaters and on HBO Max.