Sports Night rewind: 'How Are Things In Glocca Morra?' and 'The Sword of Orion' (20 August 2009)
Dan definitely plays second fiddle to Casey a lot in this first season, but the character really starts coming into his own in these later episodes, between the relationship with Rebecca … and here with his complicated reaction to Casey's secret. Dan would never, under any circumstances, keep this secret from Dana if his and Casey's roles were reversed - but then, he wouldn't have slept with Sally in the first place, and either way, it's not his secret to tell. So he's mad at Casey for what he did and what he won't say, and he's mad at Gordon, and he's mad at himself for valuing his friendship with Casey over his friendship with Dana, and the best he can do is to vent to Rebecca, who has no idea what he's talking about but likes him enough at this point not to care.