Battlestar Galactica: The Wildly Varied Career Of Lee "Apollo" Adama
3. President Lee Adama (Sine Qua Non—Season 4, Episode 8)
The search for a replacement for a missing President Roslin
eventually turns up just one viable candidate: Lee Adama himself.
According to lawyer Romo Lampkin, it’s only Lee who has the skills and
abilities for the office, and who will be able to garner the support of
both the Quorum of Twelve and of the Fleet’s military.
As President, Lee Adama is instrumental in negotiating a tense standoff with the Cylons over the fate of several hostages (including President Roslin) and the disposition of the Final Five Cylons who are living amongst the Fleet.
Ultimately, his actions lead to truce with the Cylons, and the combined Cylon-Colonial Fleet is able to follow a signal, discovered by Kara Thrace, to earth.