The group searching for the missing kids comes upon an ark crash site and rescues a girl stranded on a cliff face in episode 2x04 "Many Happy Returns".
Bellamy talks to Octavia outside the entrance to Mount Weather and two guards arrive with Echo in episode 3x03 "Ye Who Enter Here".
Bra'tac and SG-1 assault the ship where Ba'al is holding Teal'c hostage in episode 9x14 "Stronghold".