Thanos: Zero Sanctuary (comics)

Thanos, the Mad Titan, the scourge of the universe - is dead! He was executed by the one person who could have outmaneuvered him: the deadliest assassin in the galaxy, his own adopted daughter, Gamora! But before their twisted familial relationship came to a sudden and bloody end...how did it begin? Find out in an all-new adventure that takes you back to Gamora's childhood, and the day her life changed forever. What kind of a father figure could the brutal and merciless Thanos of Titan possibly have been? Prepare to see a side of Thanos and Gamora's history that has never been explored in-depth - until now!
COLLECTING: THANOS (2019) #1-6