We played that you could, but there was a question because generally the only action you can take in the brig on your turn is to try to get yourself out.

Yes a cylon in the brig can reveal himself, however most of the action on the cylon card would not be executed. The cylon would discard down to three cards and move himself to the resurrection ship.

Also, there are other actions the cylon can take in the brig: Launch Scout, Consolidate Power, Executive Order, character abilities, and the President's office.

Gaius Frakkin Baltar said:

You mean president card. You can't use the location, President's office while in the brig. But you can still use the president card to draw a quorum card as an action, or you can use the actions on the quorum cards themselves.

You can also make choices of the president on crisis cards. Such as choosing to lose 2 food on a food shortage.

A Cylon in the brig - or anyone for that matter - can take any action available to them. The brig just prevents your movement, limits your Skil input to one card during checks, and cuts your turn off early (no Crisis).

By virtue of the Cylon cards, youc an't use your special action in the Briug but you can still reveal.