Source: comicvine.gamespot.com

4. Beyond Belief

Writers: Dan Abnett and Andy Lanning
Artist: Paul Pelletier

Secret Invasion time, folks!

Secret Invasion is a Marvel comics event from 2008. It features several main teams who’ve been infiltrated by Skrull sleeper agents. Here though, the Skrull stuff is pretty peripheral.

After the Guardians return from their mission, Knowhere suffers a massive explosion. In the aftermath, the security staff notices that several of those killed were actually Skrull sleeper agents, and that sends them into a panic. Meanwhile, Starhawk is still hiding on the station and stalking Vance Astro.

Even with all of that going on, there’s a big revelation that’s way more important. During a conversation between Mantis and Star-Lord, we learn that Star-Lord convinced Mantis to use her telepathic ability to "convince" the rest of the Guardians to join the team. Drax overhears this, and the issue ends with him less than pleased about it. But this reveal in itself is pretty great. It sets the morality level at a hard gray, and makes Star-Lord come off as a huge a-hole, which is a pretty interesting development.