To be specific, it was a team-up of Galactus (as in the guy who is actually Silver Surfer's boss), Stranger, Epoch, Chaos & Order, Kronos, Love & Hate and two random celestials with Death and Mephisto jumping in afterwards. At first they launched several different assaults that Thanos warded off easily enough. Then Death actually did something and fought against Thanos which made him cry. They all took this chance to blast Thanos into space dust. Thanos then reformed himself and turned them all into hood ornaments for his snazzy death shrine. Then Eternity showed up and got his all-being ass kicked.