Required Characters: Astromech, Jedi, Shortie
Canister 1 (Jedi): Right away, Force the pieces on the left to open a small room. It sits inside.
Canister 2 (Astromech, Shortie): In the first main control room, head to the left. Use the Astromech Panel to open the door, head through into this room. Head through the large door on the right. In the hallway, head through the Shortie Passage on the right side to find a Canister in a room on the other side.
Canister 3: On the main path, sitting in the last room before the next area. On the left side.
Canister 4: Sitting just to the right of the door leading to the Generator.
Canister 5 (Astromech): From the path with Canister 2, continue on. Head through to the next area. Head right at the end of the hallway and through a door here to access the Generator. Head right once here to grab a Canister. Here is also where you'd use the Force to open up the bridge in Free Play.
Canister 6 (Astromech, Jedi): From Canister 5, continue along the path until you reach a door that leads into the main area of Depths we saw in Story. Stand in the doorway and Jump with a Jedi up to the left to get the Canister.
Canister 7: Sitting in the middle of the room with the four computers that you need to build.
Canister 8: In the second cell on the right side. Flip the levers to open the cell up.
Canister 9: Same as the last Canister, except on the left side.
Canister 10: Same as 8 and 9, except in the fourth cell on the left side.
Minikit Character: 4-LOM
Unlocked Characters: TIE Fighter Pilot (300, Apparently you're supposed to get this after Story, but I got it after Free Play, this game is weird.)