third man charged after terror raids in melbourne at the weekend .
the 18-year-old man will front melbourne magistrates ' court on tuesday .
earlier sickening details emerged about the planned anzac day terror plot .
the men had planned to run down a police officer and kill him with a knife .
they then intended to go on a shooting rampage with his gun .
it eerily mirrors the death of british soldier lee rigby in 2013 .
he was run down and then butchered with a meat cleaver .
swords and knifes were found in the teen 's houses .