After months of teasing, the two McLaren Sports Series models are ready for production and the premier supercar brand just launched a video to mark the occasion. Demonstrating the full power and extent of its abilities, the video sees both the McLaren 540C and the McLaren 570S tested to their limits in extreme environments. This testing phase was McLaren's final milestone ahead of ramping up for production, seeing the cars pushed to their limits, which include over 500,000 km of driving in everything from the Arctic to the heat of Arizona. With this demanding phase over, the McLaren Sports Series can now do what they do best: smoke the competition and make every passenger feel like a kid again. Watch the full video recapping the testing phase after the jump and look for more details on release dates as we near the new year.