In "Secrets," Red Arrow claimed that according to Martian Manhunter, M'gann stowed away on his ship after a trip to Mars, and he did not know her before that. Why does she tell a different story to her teammates?
As revealed in "Image", she is a White Martian and took on the guise of a Green Martian to fit in and lied in fear of being rejected by her peers.
As revealed at the end of the next issue, Captain Atom is Captain Adams. His primary reason for assigning the case was to find out if Wade Eiling was involved.
As seen in issue #13, it was all part of a ruse to get close to Icicle Jr., an acquaintance of hers, and coax him to spill his plans regarding his prison destination.
...and the Penalty
How can Clayface know of the relationships within the Team to go after each of them?