Guardian Squad

Guardian Squad is an American animated television series created by Travis Knight, and produced by Warner Bros. for Cartoon Network. The series is a crossover of some galactic heroe franchises such as "Halo, Metroid, Transformers, Overwatch, Star Wars, Mass Effect, Destiny, The Iron Giant, Megaman 11 and Kid Icarus. The series premiered on September 17 of 2016.

Plot
An infamous and evil order called "The Dominion Order" lead by the evil despot "Indominus Maul" plans to erradicate any being in the universe in order to rule their planet. Lord Saladin, king of the galactic kingdom "The Iron Millenium" sends magical drones called "The Ghosts" to assemble the galaxy's mightiest heroes and stop the Maul's plans.

Trivia

 * The series consists as some heroic characters that were loved by the public
 * The series was formely going to be about some famous robots, however, travis knight decided to add some human heroes of some franchises, remaining Optimus, R2d2, C3po, Zenyatta, Iron giant & Cayde as the only robotic members.
 * Travis Knight directed the Transformers's 2018 spinoff "Bumblebee", so he wanted to add Optimus in this series.