I have created this project for submission to the 2024 Young coders competition. Hope you all like it. I want to give credit to a couple of my classmates, whose names I cannot share publicly, for the story line. The theme of the competition this year is “Time and Space”. The year is 2040, and we have lost to the extraterrestrial life that invaded our solar system in 2024. Fortunately, David's time machine is finally ready and you are chosen to go back in time and save humanity. If you manage to halt the ominous oppressors' advance of conquering planets, starting from Mercury to Earth, you will have defended our way of life. All the best! P.S. There is a bug in scratch and the game will glitch if you do not double click the green flag when starting the game. The soundtracks I used for the battles are from google, and the space ambiance was from Pixabay.