Rescue Force Sigma-17 is a team of Rescue Bots. These type of Autobots were once part of a larger Rescue Bot sub-group that left Cybertron some time before the Great Exodus. Now, in the post-Great Exodus era, they are possibly the last Rescue Bots left in existence.
Rescue Bots cartoon
Family of Heroes
The Rescue Force Sigma-17 team was placed in emergency stasis to avoid detection after an unfortunate encounter with an energon eater while out on patrol. Their ship wandered aimlessly through space for an unspecified length of time, until it picked up Optimus Prime's message to travel to Earth. Optimus placed the message as a priority, reactivating the ship from stasis. After they landed in an unknown area, Optimus repurposed them to be Griffin Rock's Rescue Bots and gave them new alt-modes. They were assigned to learn human customs, values, and about their new home itself, and to protect it.