Actor-director and activist Mark Ruffalo, probably best known for playing the Hulk in Marvel's Avengers movies, has arrived in North Dakota to support pipeline protesters.

Ruffalo's first stop, upon arriving in Bismarck, was at the state Capitol. It was there, he gave his thoughts on how the pipeline doesn't need to cross the Missouri River.

Tuesday night, Ruffalo will take part in the discussion panel at Prairie Knights Casino on the Standing Rock Reservation. Tomorrow, he is planning to deliver solar trailers to the Oceti Sakowin Camp. The camp is the main protest camp, just north of the reservation. Ruffalo is also co-founder of The Solutions Project, which promotes clean and renewable energy.