The ONCE And FUTURE KANG!
Kang, feeling empowered, gloats over the captured Avengers and the sole surviving time double. Soon enough, the Avengers free themselves and engage Kang in an epic battle of monumental outcome.
The sole surviving time double is killed during the debacle.
Immortus arrives and reveals to Kang that he is his future self. Hearing this, Kang is driven MAD by the combined knowledge of his time doubles and flees into Limbo unabated. After the dust settles, Immortus sends the Avengers back to their proper timeline.