Clint and Barney are brothers with bad blood between them, after a bitter fight they went their separate ways and haven't seen each other in years. When they eventually meet again, Clint, under the mantle of Hawkeye, is an agent of S.H.E.I.L.D. and an Avenger. Barney, taking on the mantle of Trickshot, is a high-profile criminal and Clint's target. Things only go downhill from there.

Clint Barton: Jeremy Renner
Barney Barton: Norman Reedus