He returned as a full-time character in the third.

He returned to the second season as a new character due to the series' anthology format.

It's unknown if he will ever return as a character.

She returned to the role of Afia, on the 18 November 2010, this time as a regular character.

Grimlock returned in the third series as a main character.

Steven returned to the serial as a regular character following his release from hospital.

At this time, Mark returned to the series as a permanent character.

After her departure near the end of season 11, she returned again in season 13 as a recurring character.

She has been confirmed to return as a supporting character in Lightning Returns.

She returns as a guest character in "Lockdown", nine episodes later.