Circa the middle of 1st Season. Not as all part of the same scenario to be clear about it.
-Apollo & Midnighter (The Authority)
-Motoko Kusanagi (Stand Alone Complex Version)
-A Culture GCU
-Iron Man (Movie Version)
-The mining ship Red Dwarf and the folks inside it.
-The Venture Compound and the Monarch's Cocoon (The Venture Bros)
-The remnant Colonial Fleet (nBSG)
-Dr. Doom with full armor
-Ryu Hayabusa (Ninja Gaiden)
-The Iconic Player Character Band from White Wolf's Scion RPG
-Spider Jerusalem (Transmetropolitan)