 After Sheppard has been bitten by Wraith Ellia in the arm, he is rushed to the infirmary. Dr. Beckett wipes away the blood and finds no wound. He is flabbergasted and releases him. Sheppard feels fine, maybe a bit too fine. Suddenly he s better in running than Ronon and for the first time he beats Teyla with the sticks. Beckett finds out he is infected with the Wraith retrovirus. Like Ellia he will become an Iratus bug. The only treatment the medical team can think of is to inject him with Iratus bug stem cells. Beckett takes a team to a cave crowding with the creatures to obtain the cells from their eggs. With Sheppard not on duty anymore, colonel Caldwell assumes command. Immediately he starts changing things.