I Know This Much Is True series premiere TV billboards...

What's better than a TV show starring Mark Ruffalo? A television series with two Mark Ruffalos in it, that's what.

These billboards for HBO's I Know This Much Is True may be green, but there's no 'Hulk' in sight this time around for the incredible actor.

In the mini-series based on Wally Lamb's 1998 best-selling novel of the same name, Mark Ruffalo plays identical twins 'Dominick' and 'Thomas Birdsey'.

The six-episode drama follows Dominick as he struggles to care for his mentally ill brother, whilst learning the truth about his own family history.

Directed by Derek Cianfrance, the limited series also stars a stellar cast of Melissa Leo, Rosie O'Donnell, Archie Panjabi, Juliette Lewis and Kathryn Hahn.

These series launch billboards were photographed along Sunset Boulevard, La Brea Avenue, Santa Monica Boulevard and Hollywood Boulevard from April 27 to May 14, 2020.

Fans of the actor can also check out these Avengers: Endgame movie billboards, these Now You See Me movie billboards and these Spotlight movie billboards.

Daily Billboard doesn't know much, but knows that this HBO series sounds like must-see viewing.

UPDATED: Here's also a couple of Emmy consideration billboards for the HBO limited series.

These FYC billboards were photographed along L.A.'s 3rd Street and Olympic Boulevard on June 19, 2020.

UPDATED: Here's also a winter awards season FYC billboard spotted along La Brea Avenue at Sunset Boulevard on January 8, 2021.

UPDATED: Congratulations to Mark Ruffalo on his Emmy and Golden Globe wins for his acting in this limited series.

He's also up for a Screen Actors Guild Award for his performances and these SAG Awards nominee billboards were spotted along Holloway Drive and Argyle Avenue on March 1, 2021.