Naruto Episode 156 [ 480p | HD ]

Meanwhile, the Raikage prepares for a Five Kage Summit to address the Akatsuki and retrieve his brother, Killer B, from Sasuke. Naruto (Original) — "Raiga's Counterattack"

Depending on which series you are watching, "Episode 156" refers to different events. Here are the summaries for the original series, Shippūden , and Boruto :

Raiga Kurosuki wakes up and, finding Ranmaru unconscious, directs his rage toward Karashi.

Tenten is defeated by Raiga but later saves Ranmaru. Naruto, Neji, and Rock Lee struggle against Raiga’s lightning-boosted powers until help arrives.