| "I have a decision for you to make"|
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|Occupation||US CyberCom Technician|
|Affiliations|| US CyberCom|
|Hair color||Brown - Dark|
|Eye color||Brown - Dark|
|Family||Shenandoah Cassidy (Father)|
|Latest Appearance||Size Matters|
|Portrayed by||P.J. Byrne|
|“||We don't all need a chip in our head to disable an alarm. Can you believe this guy?||”|
–To Lillian and Gabriel, Secrets of the Secret Service
In "Pilot" Nelson's father Shenandoah Cassidy is kidnapped. He asks Gabriel to find him. When Gabriel figures out the kidnappers took the safe of Dr.Cassidy he says his father's autobiography was stored in there but later admits his father did make a second clockwork chip and it was in the safe. He is suspected to be behind the kidnapping but he denies it. Lillian Strand, director of the US CyberCom interrogates him. He is later cleared when Gabriel learns it was Amos Pembroke who was working with the kidnappers.
In "Red X" he along with Gabriel searches for information about the bomber who blasted himself on a US Marine base in Afghanistan. While Gabriel and Riley went to the Phalanx Global Security Headquaters to stop the bomber Nelson shut downs the cellphone towers in the nearby area to block the signal of the detonator. When the bomber is killed he and his father retrieve the explosives from the dead suicide bomber's stomach. They find out bomber didn't swallow all the red x that was stolen and there is still enough for another bomb. They inform the rest of the team about it.
Shenandoah Cassidy is his father.
He has a sibling rivalry with Gabriel.
|“||Want to question the banker and the candlestick maker?||”|
–To Gabriel, Red X
|“||(Cups his hands around his lips) Luke...I'm your father.||”|
–To Gabriel, Secrets of the Secret Service
|“||She's a Disney villain||”|
–To Lillian(Behind her back), Patient Zero