Well it has been an eventful 24 hours in the voting world. Despite some espionage and death threats from the Cult of Adric, we managed to get through it and get the correct results, and the votes are now in.
Adric recieved 10% of the vote
Turlough recieved 13% of the vote
Nyssa recieved 20% of the vote
Peri recieved 25% of the vote
And the winner of wave 5, going through to The Ultimate Companion poll and joining Susan, Jamie, Jo and Romana1 is Tegan who recieved 32% of the votes.
After joining the TARDIS crew in 1981's Logopolis, Tegan was the longest continuing companion on the show, staying for three years and one month before finally leaving in 1984's Resurrection Of The Daleks.