"The Hero in Absence"
Firelord and Drax are on Titan awaiting the arrival of the Silver Surfer, when suddenly half of the universe vanishes, including Mentor and Starfox.
Drax believes that Firelord is some how responsible, and attacks Firelord until eventually he comes to his senses.
They are then magically transported to Earth by Doctor Strange, where the heroes are gathering to take on Thanos and his threat to the universe.