He also made a guest appearance in episode 7 Submarine of Series 4 .
Alexander played Dexter , Sasha 's brother , for two episodes , in Series 3 of the CBBC show The Dumping Ground .
Alexander also made a guest appearance in episode 7 Submarine of Series 4 .
Alexander played Dexter , Sasha 's brother , for two episodes , in Series 3 of the CBBC show The Dumping Ground .