Yes, you can unlock Dark Kahn, but it is extremely hard. You must complete arcade mode with all 22 (the starting 20 and 2 that you unlock) characters on the hardest difficulty without using a continue. If you can do that, you will have Dark Kahn as a playable character.
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No of course not
Yes you have to be online to play DC universe its an mmo so of course its online only
Go to the psn store then search dc universe online then when it shows up click on it and then press download
No, DC Universe Online requires a permanent internet connection as wel as a monthly fee for PC to play it.
you cant