Thanos Is An Avenger!

Thanos as an Avenger.

Thanos is portrayed as only as a villian, but it is interesting to note that Thanos was once a part of Avengers fighting alonside with Captain America, Captain Marvel, Hulk so on...

His sole aim as we all know is to erase half of the universe. But as all villian's mindset works, they always want to get the job done by themselves. But when someone else comes in their way, they obviously will oppose them. The same occured here. An enemy group much stronger than Thanos and his Black Order arrived to destroy the entire Marvel Universe. Thanos was forced to team up with the heroes to defeat the enemy group, paving the way for Thanos to eventually become an Avenger.  

Captain America thinking on whether Thanos must be included in the Avenger.

Thanos and Thor were such a pair. The enemy group were called Builders. They were a modified mutants different from those of X-Men. Thanos and the Black Order struck the earth when Thanos were in search of his son, Thane. 

Thanos and Thor fighting alongside.

So, why did Thanos decide to help Avengers? Because Thanos's son Thane is himself a Builder. He was one of the first natural born Builder in a million year. So the Builders were not ready to let Thane get into the hands of The Mad Titan, Thanos. They knew that if Thane becomes reunited with his dad, Thanos. He would become exactly like his dad. So, he had to team up with Avengers to defeat the Builders and take away his rightful son, Thane.

Avengers Assemble. 

For some unknown reasons, the comic strip was left uncompleted. So the last comic strip of this series was the signaling of the Builders to the One-Above-All for help. No idea what happens hereafter...

Thanos teaming up with Avengers.