Season 5 is a modded single-player game in Science mode, and the goal is that no kerbal dies. This stream opens in the Research and Development building with 143.1 science and builds one new rocket, Science9, with no crew aboard. "I'm trying not to lose anybody, and so I'm trying out unmanned stuff before I actually send in manned guys." Science9 reaches orbit around the Mun, runs its experiments there and comes home to Kerbin's ocean. Nobody is lost, and the next research is just out of reach.
New research and a robot rocket
The stream starts on the tech tree. Advanced Rocketry costs 45 and brings the LV-909 "Terrier" Liquid Fuel Engine, which drops the science to 98.1. Fuel Systems costs 90 and brings bigger tanks such as the FL-T800 Fuel Tank, leaving 8.1. "I want to have more fuel when I get up there."
In the VAB the old design is set aside. "Let's just start over." The new rocket gets an SC-9001 Science Jr., a heat shield, and a service bay that holds the goo canisters and the barometer behind doors that close for reentry. A thermometer, an antenna, batteries, two solar panels and parachutes go on the outside. Below that come liquid fuel stages, fins, struts and a ring of solid fuel boosters for the first kick. A viewer suggests turning on angle snap, and the parts finally line up. "I've always been trying to line things up as carefully as I can." The craft is saved as Science9. "Let's get rid of our crew. We're gonna go robots."
Up at night and off to the Mun
Science9 lifts off from a dark launch pad. The solid boosters run out first, and the rocket holds steady without spinning, but it will not lean over much. "This thing's kind of letting me know that it doesn't really want to bank." It climbs almost straight up, and a long burn at the top pays for that. "Okay, so we are orbiting. It's a safe orbit."
The Mun is set as the target and a maneuver node goes on the orbit. The burn starts with the craft pointed the wrong way. "I was pointing the wrong way, but everything's fine now." The encounter with the Mun still shows up on the map, and Science9 coasts out to it.
Science high over the Mun
Near the Mun, the commentary checks the cost of staying. "Orbiting would be a seven-second burn." The short burn puts Science9 on a closed orbit around the Mun. The craft runs its experiments: a materials study in the Science Jr., a goo observation, a temperature scan and a pressure scan, all "while in space high over The Mun".
The data stays aboard to be carried home. A burn on the side closest to Kerbin sends Science9 out of the Mun's pull, and another sets the low point of the orbit inside Kerbin's air. "This shows that this will probably work if we actually bring a person."
The long way down
The spent engines are dropped, and the commentary says an engine fired by mistake: "I screwed up that engine fire." Science9 hits the top of the atmosphere at over 3,000 meters per second and burns a long orange trail, but it does not slow down enough to stay. It swings back out into space for another lap.
The same thing happens again, and again. "Okay, third time's a charm, right?" The commentary notes that a kerbal would be fine on a trip this length even with no life support, and plans to add some for the next design. On the last pass the orbit drops for good. "We are now no longer orbiting. Looks like an ocean landing."
Where it ends
The parachutes open over the water, and Science9 splashes down in the ocean. The goo and the barometer are read once more on the water. "Safe trip, and that was even without any people."
The Mission Summary for Science9 lists 7 experiments recovered and 81.5 science earned, bringing the total to 89.6. The best haul is the materials study from high over the Mun, at 32.6. Back on the tech tree, the next nodes cost 90. "So we're one short." The stream ends at the Space Center with no kerbal lost.