Clarke, Finn, and Wells collect some plants for Jasper's wounds in a river in episode 1x03 "Earth Kills".
Lincoln works to heal Octavia's arrow wound on the shores of a river in episode 2x01 "The 48".
Clarke washes ashore and is saved by Anya after jumping off the dam in episode 2x03 "Reapercussions".
Clarke fakes passing out and then attacks Roan while he is transporting her in episode 3x02 "Wanheda: Part 2".
Octavia is watching a group take water samples for Pike when a Grounder kid approaches in episode 3x06 "Bitter Harvest".
Octavia falls down a hill while running from a mysterious pursuer in episode 1x05 "Twilight's Last Gleaming".
Lexa leads a procession with Finn's body to the Grounder town of Tondc in episode 2x09 "Remember Me".
Emori joins Murphy and they attempt another ambush only for Murphy to be taken captive in episode 3x05 "Hakeldama".
Clarke and Bellamy locate a supply bunker and find a bunch of guns in episode 1x08 "Day Trip".
The group investigates the crash site of the hijacked dropship in episode 1x10 "I Am Become Death".
The survivors from the ark set up camp in the remains of Alpha Station in episode 2x01 "The 48". From episode 2x02 "Inclement Weather". From episode 2x03 "Reapercussions". From episode 2x04 "Many Happy Returns". From episode 2x05 "Human Trials". From episode 2x07 "Long Into an Abyss". From episode 2x08 "Spacewalker". From episode 2x10 "Survival of the Fittest". From episode 2x11 "Coup de Grâce". From episode 2x16 "Blood Must Have Blood: Part 2". The camp is renamed Arkadia and expanded in episode 3x01 "Wanheda: Part 1". From episode 3x02 "Wanheda: Part 2". From episode 3x04 "Watch the Thrones". From episode 3x05 "Hakeldama". From episode 3x08 "Terms and Conditions". From episode 3x09 "Stealing Fire". From episode 3x10 "Fallen". From episode 3x12 "Demons".
Abigail goes to meet with Indra to try and negotiate a lighter sentence for Finn in episode 2x08 "Spacewalker".
Octavia leads people in a rescue attempt after the missile attack in episode 2x13 "Resurrection".
Clarke and Lexa hold their final war meeting before the assault near the base of Mount Weather in episode 2x15 "Blood Must Have Blood: Part 1".
Lincoln leads Clarke and Finn through the mines back to their camp in episode 1x12 "We Are Grounders: Part 1". Clarke and Anya have to escape through these tunnels in episode 2x03 "Reapercussions". Octavia and Indra lead and assault through the tunnels in episode 2x15 "Blood Must Have Blood: Part 1".
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".
A girl from Mount Weather wakes up in a meadow outside the facility and quickly succumbs to the radiation in episode 2x07 "Long Into an Abyss". Later Carl Emerson arrives back at Mount Weather in episode 2x12 "Rubicon".
Clarke and Lexa prepare for the upcoming war with Mount Weather in episode 2x14 "Bodyguard of Lies".
Clarke, Lexa, and Lincoln locate the sniper from Mount Weather who is firing on Tondc in episode 2x13 "Resurrection".
Clarke and Lexa are riding back to Arkadia when they come upon the murdered Grounder army in episode 3x05 "Hakeldama".
Octavia rides to the Grounder village to warn them of the coming attack in episode 3x06 "Bitter Harvest".
Bellamy finds out his stolen key card has been deactivated and is set upon by guards in episode 2x14 "Bodyguard of Lies".
Bellamy works to sabotage the acid defense system used by Mount Weather in episode 2x14 "Bodyguard of Lies".
Jaha enters the strange mansion and finds himself talking to a hologram in episode 2x16 "Blood Must Have Blood: Part 2". Murphy finds his way to the mansion after being trapped in the bunker and talks to Jaha in episode 3x01 "Wanheda: Part 1".
Murphy enters a fancy bunker after landing on the beach and finds a video from someone before the bombs in episode 2x16 "Blood Must Have Blood: Part 2". He finds himself trapped in the bunker for several months in episode 3x01 "Wanheda: Part 1".
The gang follows Lincoln's map to the shore and find a group of stacked rocks where they light a signal fire in episode 3x13 "Join or Die". The gang wakes back up on the beach after being kicked out by Luna in episode 3x14 "Red Sky at Morning".
Echo leads the Sky People through the hidden tunnels underneath Polis in episode 3x03 "Ye Who Enter Here". Murphy and Pike saves Bellamy's group and they run the elevator up to the top of the tower in episode 3x15 "Perverse Instantiation: Part One".
Marcus marvels at Polis when the crew arrives for the negotiations in episode 3x03 "Ye Who Enter Here". Lexa battles Roan in episode 3x04 "Watch the Thrones". Octavia talks Indra out of her funk in episode 3x07 "Thirteen". Roan escorts Clarke into town to draw Ontari out in episode 3x15 "Perverse Instantiation: Part One".