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Episode 1 Tribal Pick 'Em:
The contestants of Survivor: Gabon will be divided up into two tribes at the very outset by a good old fashioned schoolyard pick ’em, which will immediately lead to the contestants’ first challenge. (Source: EW)

Cast line-up. Survivors introduce themselves before tribal pick.

Eldest tribe members, Bob and Gillian start the tribal pick

Bob picks Ace first (Kota tribe)

Gillian picks Crystal (Fang tribe)Ace has chosen Jessica (Kota)Crystal picks Susie (Fang)

Jessica has chosen Marcus (Kota)Susie chooses Matty (Fang)Marcus chose Charlie (Kota)Matty chooses Randy (Fang)

Danny picked before Ken (Fang)Charlie picks Kelly? (Kota)

Danny picks Dan? (Fang)Kelly picks Paloma? (Kota)Dan picks Ken (Fang)

Corinne last picked for Kota ,Michelle is last picked for Fang

Survivors retrieve athletic shoes?

Jeff Probst explains challenge to Kota tribe,
Standing in background to right: Gillian, Randy, Matty from Fang tribe

Survivors compete in a running challenge...running downhill past rocks... possibly for individual immunity?
Episode 1 Immunity Challenge:
Per Challenge Producer John Kirhoffer in the TV Guide Channel Preview: "There are 9 players in each tribe and 6 of them are tied together. They're wearing belts with ropes in between them. They race through this obstacle course. They come running down the hill, charge through the swamp. They come up and over a tall A-frame then they start charging up a hill, 150 yards up a hill. They crawl under a set of fence posts, over, under, over again. Then they charge up to the dig area where they will dig three bags of puzzle pieces. Down to a gate. They have to dig under the gate, all 6 pieces pieces [bags] and the players under. Pass the puzzle pieces off to the three remaining players who will then have to assemble a long puzzle of their tribe's flag

Challenge start, 6 players from each tribe at start mat

6 tribemates are tethered together
Kota: Ace, Jacque, Charlie, Kelly, Corinne, Marcus
Fang: Dan, Michelle, Crystal, Matty, Ken, Danny

Charge through the swamp, Kota Tribe in swamp

Come up and over a tall A-frame

Kota tribe on A-Frame

Crawl under a set of fenceposts, over, under, over again

Charge up to dig area. Dig up three bags of puzzle pieces

Dig under the gate, all 6 pieces pieces [bags] and the players under gate - Dreamteamers/Media practicing challenge

The three remaining players who will then have to assemble a long puzzle of their tribe's flag (Dreamteamers/Media practicing challenge)
Puzzle solvers for Kota: Bob, Jessica, Paloma
Puzzle solvers for Fang: Gillian, Randy, Susie