GotG Xmas special

[Shamikebab]

Cosmo was in the GOTG 1 credit scene but yeah not 'introduced' as such

 

[bazzabear]

Indeed. The Collector had Cosmo in one of his glass exhibits.

And in GotG1 Peter talked to the other Guardians about a great hero of Earth - and then described the plot of Footloose. So that's where Bacon comes into it.