*spoilers ahead if you haven't seen up to season six episode six*

PREVIEW: WHOSE voice was that?

The question has left The Walking Dead's fans scratching their heads since the final line of Always Accountable.

As Daryl (Norman Reedus), Sasha (Sonequa Martin-Green) and Abraham (Michael Cudlitz) drove presumably back towards Alexandria, a voice came over the radio with just one word: "help".

Who was it? Why are they calling for help?

This week's episode will be all about Alexandria, and how the people in it are slowly starting to work together.

Rick (Andrew Lincoln) has always been the leader, but when the group arrived at Alexandria they lived under the rule of the town's leader Deanna (Tovah Feldshuh).

The relationship between each group has been shaky since the start, though the Wolves' attack earlier this season brought them slightly closer out of necessity.

As the horde outside Alexandria's walls continues to grow the group are going to have to find a way to work together sooner rather than later.

A few more things:

• Will Maggie (Lauren Cohan) go out again to find Glenn (Steven Yeun), whose fate is still unknown?
• Will Darly, Sasha and Abraham make it back to Alexandria?
• Spencer (Austin Nichols) has shown he can be slightly out of control. Deanna's son stopped the townspeople from raiding the food stocks only to steal from it himself.

Let us know your thoughts in the comments below.

The Walking Dead airs Mondays at 12.30pm and 7.30pm (AEST) on FX (Channel 119).