[When the numerous vials from within the clinic jostle, Megatron knows Sixshot has arrived. He leaves through the door with some mangled red-and-white metal, a datapad, and First Aid's medical drone following close behind.]

Ratchet, First Aid, and Red Alert have all gone missing. You'll be in charge of a rescue mission to find them.

[He presents the first object - the mangled metal.]

It's a little morbid, but this was Ratchet's leg. It's been.. laying around.