Dr Ryder was a member of the Friends of the Ood.
Biography
Ryder had been working for Ood Operations for ten years to try and stop the Ood slave trade. He succeeded in his plans to destroy the firm. After he allowed the Ood to rebel, he went into Warehouse 15 and he saw his boss Klineman Halpen place detonaters around the Ood Brain. He revealed his plan to release the Ood but was killed by Halpen, who threw him into the Ood Brain. The brain absorbed and suffocated him. (DW: Planet of the Ood)