Which two kings of Midian did Gideon pursue across the Jordan and capture?

Answer: Zebah and Zalmunna

Gideon chased Zebah and Zalmunna to Karkor, captured them, and later killed them for slaying his brothers at Tabor.

“When Zebah and Zalmunna fled, Gideon pursued and captured these two kings of Midian, routing their entire army.”— Judges 8:12 (BSB)