Robot soldier
The robots are operated by Shaak ti & Rachel (with a little help with Professor Pericles) to annihilate Carrie & kidnipped Darwin.

They are robots built to resemble World War II German humanoid soldiers. Rachel built them cause she still have revenge on Carrie (cause she's hanging out with Darwin). Until Crowbar killed them all, But its to late. Rachel took Darwin in the The Darkstar Council as a prisoner, but when Rachel knew that what she was doing was wrong she decided to let Darwin go, after that she made knew robots to help Gumball and his team fight Megatron.