In the final episode, rookie driver Stoffel Vandoorne and two-time world champion, Fernando Alonso, get behind the wheel of the new McLaren at testing in Barcelona. By the end of the test, they've blown nine engines. The future of McLaren-Honda is in jeopardy and senior management must make a difficult decision.

Rookie driver Stoffel Vandoorne, is about to begin his first season in F1 with McLaren-Honda alongside two-time champion Fernando Alonso. Stoffel has his first seat fit, tests the new car and engine in a simulator and sees the chassis of his car being completed. Stoffel finds out the price to be paid for entering the exclusive world of F1, with a gruelling PR schedule.

The McLaren-Honda team prepares for the big car launch. Rookie driver Stoffel Vandoorne and two-time world champion Fernando Alonso are at the McLaren Technology Centre to unveil the car to the world's media. How will everyone react to the new design and scheme? Behind the scenes, the engine's build issues leave the team weary. Everyone is left wondering how the car will perform in Barcelona.

Stoffel Vandoorne, Fernando Alonso and the McLaren-Honda racing team continue to prepare for the 2017 season. Stoffel's gruelling fitness regime intensifies with endurance training. In the UK, 700 engineers, mechanics and designers are racing to build a new car for Stoffel and Alonso. The final piece of the car-build arrives: the new Honda engine for fire-up. But will all go according to plan?