A character looses its cosmic counter when is stunned...when is recovered, the character recover the cosmic counter? or it is lost forever?:( ..is there any way to recover counters??...Thanks!

A lost counter is gone, and won't come back until another card puts it back on the unfortunate character.

To name a few options, there's Professor Hamilton, Cir-El, New Genesis and the Motherbox.
Note though, that most of these cards only works for specific teams.
If all else fails, you can of course recruit another copy of the same character again to get back your cosmic counter, though that won't work wonders for your board advantage;)

Regards
Melkhor, always helpful, with, or without, a cosmic counter

Thanks Melkhor!!..Actually i have a copy of Professor Hamilton but not enough Suepr Team characters on my deck to use it well!!....i guess i'll have to change my strategy!!..;)