The aliens can assume human form, and are preparing the way for their buddies at Wayne Corp.
Of course emprisoned by the Alien infiltrated Government.
The sole Survivor of Mars who locked up the other race.
Before a human astronaut had to open the door.
Superman at Mushroom forest in 'Hereafter'
Conspiracy Researcher The Question in 'Fearful Symmetry'
(I downloaded all the Question comics immediately after seeing this episode.)
The Question of the DC Animated Universe is a completely obsessive, darkly comic loner — skeptical, eccentric, paranoid, antagonistic and somewhat unpredictable. He is given to believing in abstruse conspiracy theories and is suspicious of even his fellow League members; despite this (or perhaps because of it), he is one of the Justice League's best detectives. At one point, he mentions that Supergirl eats peanut butter sandwiches before going to bed, to which she asks him whether he goes through her trash: he responds, "Please... I go through everyone's trash."
The Question's various conspiracy theories, which he insists are a single, tied-together theory, are usually portrayed in a humorous manner. He claims the motives and purpose of aglets (the plastic caps at the end of shoelaces) are "sinister", that the government is brainwashing people through "secret messages, coded in amino acid chains in low-carb cereal bars", believes in ominous links between boy bands and global warming, the Girl Scouts and the crop circle phenomenon, and fluoridated toothpaste and spy satellites.
Atlantis in 'The Enemy Below'
Faust in 'Paradise Lost'
Stargate Interdimensional Travel in 'Legends'