When Loki arrived on Earth, Thanos is contacted by him, and the Other warns the God of Mischief of the price of failure and reminding him to not question the will of the master, declaring that if he fails in defeating the Earthlings, Thanos will make him know a new kind of suffering.
When eventually Loki is defeated, The Other complains that the Earth's inhabitants are not as weak as they were supposed to be and declares that challenging the Earth's heroes would be to court death. To this, Thanos simply smiles.
Upon learning of Gamora's imprisonment in the Kyln, Ronan was called to Sanctuary by the Other, who he quickly killed after a brief argument. Ronan then proceeded to call Gamora a traitor, prompting Thanos to finally speak and intimidate Ronan into retrieving the Orb and Gamora, over Ronan's life.
After Ronan retrieved the Orb, he immediately contacted an enraged Thanos, informing him that he was out of the deal, promising that he would destroy Xandar himself before coming for the warlord himself. To this, Thanos simply responded by cutting the transmission in anger.