Question: when did the infinity stones appear in comics

title: Infinity Gems
text: The Soul Stone is first seen in Avengers : Infinity War . Some time prior to Guardians of the Galaxy , Thanos tasked Gamora to find the Soul Stone , because unlike the other Infinity Stones , there is little record of its existence . Gamora found it hidden on the planet Vormir , but decided not to tell Thanos and kept the secret with Nebula . After Thanos captures and tortures Nebula , Gamora agrees to take him to Vormir , where they encounter the Red Skull , who serves as the Stonekeeper . Red Skull informs Thanos that he must sacrifice someone he loves to acquire the stone ; the latter obtains the stone after throwing Gamora off a cliff . The Soul Stone houses a world within itself , as shown when Thanos speaks to Gamora 's child - self .