Where, and why?

When Hawkmoth goes missing, the Hero Squad does whatever it takes to find him...UNTIL... a mysterious portal in the sky causes them meet up with the Paladins of Voltron! Teaming up to find Hawkmoth the two groups find themselves in the Steven Universe universe...only to discover that the diamond Zarkon and Hawkmoth have teamed up to take over the multiverse!!!!!!!

(And, yes...there is Klance. ;) )