Ah, du snakker om episode 10x03 (ja, jeg googla :P - http://www.stage6.com/sstargate/video/1591640/SG1-10x03). Du må nok se episoden en gang til.
For å svare på spørsmålene:

1. De fulgte spor etter Merlins (?) våpen for å ha motstand mot The Ori. Dette førte dem til Atlantis
2. De ville ødelegge supergaten vha et sort hull og nukes, men det var ikke nok. Introduksjonen av wraith i SG1 var kun at de sprengte det i sin galakse (ved det sorte hullet) og energien ble videreført til den andre galaksen og tok ut skip nummer to samtidig. Altså separate steder, synkron hendelse.
3. Dersom du har sett ferdig sesong 10 vet du hva som skjedde invasjonen, mens "ettertroppene" tas opp i filmen som kommer.

Så var det back to work :P

Kanskje jeg skal prøve meg litt på SG-1. Men er jævlig lei av Macgyver! :-) :P

Season 5

The SciFi Channel announced that Stargate Atlantis has been renewed for a fifth season, which began production in February, 2008[14] and is scheduled to air in late July or early August, 2008.[15] Actors Joe Flanigan, Rachel Luttrell, Jason Momoa and David Hewlett have been confirmed to be returning for the fifth season, reprising their roles as Lt. Col. John Sheppard, Teyla Emmagan, Ronon Dex and Dr. Rodney McKay respectively. Due to the SciFi Channel's acquisition of the Sanctuary web-series, Amanda Tapping (Col. Samantha Carter) will not be a regular cast member in Season 5, but will return as a special guest star for "...several episodes."[14] Actress Jewel Staite (Dr. Jennifer Keller) will be returning and has been promoted to series regular.[16] The season will feature two new characters, Captain Alicia Vega (to be played by Leela Savasta) and Alice Porter (actress unknown). Captain Alicia Vega (formerly Alice Porter), who will be a new member of the Atlantis expedition's military contingent, will be introduced in the season opener "Search and Rescue" and will be commanding her own recon team by the episode "Whispers" [17]. Alice Porter will be introduced in the episode "Whispers" [18]. Robert Picardo (Richard Woolsey) will join the show as a regular cast member and become the new commander of the Atlantis Expedition. He will appear in 14 of the 20 episodes for the new season.[19] The season will also see Paul McGillion (Dr. Carson Beckett) return for five episodes and Michael Shanks (Dr. Daniel Jackson) appear in at least two episodes.[16] Despite earlier plans, Torri Higginson (Dr. Elizabeth Weir) will not be returning for the fifth season. According to executive producer Joseph Mallozzi, the actress has turned down an offer to guest star in the fifth season.[20] During the course of the season a new race will be introduced and the show will celebrate the milestone of 100 episodes.[14]