A lot is riding on Col. O'Neill's fron - the Ancient word for head: Having had the repository of Ancient knowledge downloaded into his mind he now hopefully will soon know the secret location of The Lost City of the Ancients where the power to defeat Anubis is thought to lie. And with Anubis and his super-drone army rapidly approaching Earth SG-1 can only pray that O'Neill will go Ancient soon - even though everyone sadly knows that when that happens O'Neill's physical composition won't be able to stand the transition for long and he will die. The process seems to have already begun: Dr. Daniel Jackson notices O'Neill has written some Ancient words into a crossword puzzle he was trying to finish while he can still read English. Daniel discerns that they are not words but syllables of two words - Praclarush Taonas the planet where the Lost City lies. But Daniel also figures out that each syllable also is a clue to the planet's stargate address - one they tried dialing two years ago without success. That means the stargate is buried. Maj. Carter can use the address to chart the planet's position in space but they'll have to travel there by ship. Dr. Elizabeth Weir - the newly installed head of Stargate Command - reminds them that the starship Prometheus can't be taken now as it is Earth's last line of defense against Anubis. Teal'c and Bra'tac however have procured an unarmed interstellar cargo ship on Chulak. The ship was stolen from Anubis by a free Jaffa named Ronan who joins them in their mission. They and SG-1 travel to Praclarush Taonas with a load of equipment that O'Neill has packed without knowing why. O'Neill also senses they're not traveling fast enough and he modifies the engines in a way that even Carter can't fathom. She tells O'Neill she has authorization to take control of the team if she determines his brain has become too overwritten with Ancient consciousness. He tells her to take command now. Anubis begins the attack on Earth. An American aircraft carrier and a battle cruiser are destroyed by one of his ships. Communications across the planet are knocked out. Vice-President Kinsey runs to Stargate Command to 'gate to the Alpha Site. At the White House President Hayes - who has been meeting with top officials including Gen. Hammond and has spoken with a projection of Anubis himself - tells his team to stand and fight. He orders the Prometheus to launch.