The three episodes cover the main Hydra story arch starting with episode 16 "End of the Beginning" at 8pm followed by Episode 17, "Turn, Turn, Turn" at 9pm and finishing at 10pm with the season finale "Beginning of the End".
If you know anyone who hasn't been convinced to watch (or catch up on) Agents of S.H.I.E.L.D. this is a great opportunity to get them hooked back in. Why not consider throwing a viewing party and inviting your friends!
Throughout the summer until Season 2 begins in September ABC may air further repeats and we will keep our schedule page up to date so you will always know when to tune in.