[Jack_]

Battle of the Block is a season ruining twist which basically entails two HoH's being crowned each week, they both nominate two HGs, a competition between the two sets of nominees then takes place and the winners free themselves from the block, gain immunity for the week and in the process dethrone the HoH that nominated them - meaning they could potentially be nominated post-Veto. The rest of the week plays out as normal

It first appeared in BB16 and lasted way beyond jury when everyone thought it would finish then, everyone thought there'd be a new twist for BB17 but on the premiere night Julie declares that the 'fan favourite twist' (despite the fact everyone hates it) is returning, angering 99% of the viewers

Thankfully it doesn't last as long but it still brought with it the end of the key wheel for nominations (which last appeared in BB15) and was an iconic part of every BBUS season since BB2. But that's a minor point and something only diehards care about

But yeah it sucks