Sonic Wing Mode

Sonic Wing Mode was a combination between Optimus Prime and Wing Saber.

Cybertron anime
After Starscream has stolen 3 Cyber Planet Keys and the Omega Lock from the Autobots, he gained incredible power and the Autobots had no chance to defeat him, until Wing Saber asks Optimus to combine. Prime refuses at first, saying that worked once, but not a second time. But after Starscream blew up some more of his team, he changed his mind. After the first attempts failed, they finally managed to combine into the powerfull Sonic Wing Mode. The surprised Starscream didn´t stand a chance against this power, was defeated and warped away by Sideways. The victorious Autobots, then headed for Cybertron, to stop Megatron from retaining the Omega Lock. After a long battle, Optimus (in Sonic Wing Mode) defeated Megatron in the fire dimension, took the Omega Lock and headed back to Cybertron.