Avengers Assemble #7

In-Betweener and Stranger aren't actually members of the group styling themselves Elders of the Universe, although they are beings who've been around a very long time. The Elders like Champion, Collector and Contemplator are the last members of extinct races from early in the history of the universe. They have become immortal and each chosen a speciality to devote their time to. But In-Betweener is a cosmic entity like Chaos and Order. Stranger is also an immortal alien of unknown provenance, but it has been suggested he too is a cosmic entity related to the Living Tribunal. I don't know why Thanos singled these guys out for revenge. Stranger *was* part of a cosmic consortium that defeated him in the Infinity Gauntlet limited series. But when Thanos met Champion, Contemplator and In-Betweener during Thanos Quest he bested them to obtain their Infinity Gems. And I don't know of any meeting with Contemplator. But they all may have clashed outside Marvel's known history. I also don't know why Iron Man's suit didn't protect him from the vacuum, even if it isn't specifically space armour. The gun Star-Lord uses to expel the Badoon from his ship seems to me to send them out with a blast of air. I.e. it seems like his Element Gun dating back to his 1st appearance in Marvel Preview #4. But he's supposed to have lost that gun with his sentient Ship and his original costume before the 2003 Thanos series. (But as I said in #5 it now looks like he's got costume and Ship back.) The only sentence Groot ever utters is "I am Groot". But Rocket Raccoon is able to interpret the subtle nuances with which he says it, and translate for the others.